Page 2 of 2 FirstFirst 12
Results 17 to 29 of 29

Thread: How to get better mpg?

  1. #17
    Admin Saracen's Avatar
    Join Date
    Jul 2003
    Posts
    17,362
    Thanks
    819
    Thanked
    2,955 times in 2,096 posts

    Re: How to get better mpg?

    It's all been said, really, but my 2p ...

    - check tyre pressures. it does matter.
    - gentle acceleration/braking
    - read the road and anticipate
    - it seems to help ... keep windows closed. Avoid aircon, too.
    Noli nothis permittere te terere.


  2. #18
    Senior Member
    Join Date
    Jan 2005
    Location
    Manchester
    Posts
    2,590
    Thanks
    53
    Thanked
    96 times in 81 posts
    • Butcher's system
      • Motherboard:
      • MSI Z97 Gaming 3
      • CPU:
      • i7-4790K
      • Memory:
      • 8 GB Corsair 1866 MHz
      • Storage:
      • 120GB SSD, 240GB SSD, 2TB HDD
      • Graphics card(s):
      • MSI GTX 970
      • PSU:
      • Antec 650W
      • Case:
      • Big Black Cube!
      • Operating System:
      • Windows 7

    Re: How to get better mpg?

    Quote Originally Posted by Saracen View Post
    It's all been said, really, but my 2p ...

    - check tyre pressures. it does matter.
    - gentle acceleration/braking
    - read the road and anticipate
    - it seems to help ... keep windows closed. Avoid aircon, too.
    Windows closed definitely helps; an open window creates a lot of drag and you have have burn fuel to overcome that.

  3. #19
    Admin Saracen's Avatar
    Join Date
    Jul 2003
    Posts
    17,362
    Thanks
    819
    Thanked
    2,955 times in 2,096 posts

    Re: How to get better mpg?

    Quote Originally Posted by Butcher View Post
    Windows closed definitely helps; an open window creates a lot of drag and you have have burn fuel to overcome that.
    Yeah, I understand the logic. I've just never seen hard evidence and my own tests aren't extensive enough to be conclusive.
    Noli nothis permittere te terere.


  4. #20
    BOFH Bagnaj97's Avatar
    Join Date
    Jan 2011
    Location
    Kent
    Posts
    1,136
    Thanks
    379
    Thanked
    357 times in 208 posts
    • Bagnaj97's system
      • Motherboard:
      • Asus B150M-A
      • CPU:
      • Intel i7-6700
      • Memory:
      • 2x8GB DDR4 2133
      • Storage:
      • Sandisk Ultra II 480gb, Plextor M5S 256G SSD, 2x 2TB HDDs
      • Graphics card(s):
      • Sapphire RX480 Nitro+ OC 8GB
      • PSU:
      • NZXT Hale90+ 550w
      • Case:
      • Xigmatek Alfar
      • Operating System:
      • Ubuntu/Windows 10
      • Monitor(s):
      • AOC I2367Fh
      • Internet:
      • 71/18 MBps down/up Plus.net FTTC

    Re: How to get better mpg?

    Quote Originally Posted by Butcher View Post
    Windows closed definitely helps; an open window creates a lot of drag and you have have burn fuel to overcome that.
    Clearly for MPG you want windows closed and aircon off, but sometimes it's just too hot and you have to do something. I've read in the past that ~30mph is a transition point - below that it's more economical to have windows open and aircon off, above that aerodynamics are more important and it's more economical to shut the windows and use aircon. I can't find a source, and presumably the exact speed will depend on the aerodynamics of the car in question, but it sounds sensible.

    Of course you could keep the windows shut and use the fans/blower without aircon...

  5. #21
    HEXUS.timelord. Zak33's Avatar
    Join Date
    Jul 2003
    Location
    I'm a Jessie
    Posts
    32,222
    Thanks
    1,986
    Thanked
    2,180 times in 1,355 posts
    • Zak33's system
      • Storage:
      • Kingston HyperX SSD, Hitachi 1Tb
      • Graphics card(s):
      • AMD R9 290 4gig
      • PSU:
      • Coolermaster 800w
      • Case:
      • Silverstone Fortress FT01
      • Operating System:
      • Win10
      • Monitor(s):
      • Dual Benq 22" 1680x1050
      • Internet:
      • Zen FTC uber speedy

    Re: How to get better mpg?

    Quote Originally Posted by Saracen View Post
    Yeah, I understand the logic. I've just never seen hard evidence and my own tests aren't extensive enough to be conclusive.
    front windows open a tad aren't too bad

    rear windows are a bloody nightmare... open to slow down ;-)

    your eardums can tell you....the buffeting and the cabin pressure thrumming tells you,


    Tyre pressures. In some cars the handbook states higher tyre pressures for genuine advantages. I run most of my cars highers than normal anyway .. I prefer the harder tyre walls particulalry on the rears, but they do lose a little grip in some conditions.

    accelerate with about 40% throttle up to the speed you want then feather the throttle

    dont fanny around really slowly building your speed... the fuel improvements are minimal compared to the time you lose in your life going no where

    the best thing for fuel consumption though is your eye sight and your brain

    traffic prediction....lift off WAY before the roundabout and coast (IN GEAR,.,.,never in neutral) and just roll towards it... . you;ll soon realise that you end up at the roundabout still needing the brakes!

    NEVER leave a roof rack on! Ever.

    but don't be tempted to drive like a vicar every day as all modern diesels hate it...and it'll cost you in fuel anyway when you then have to regen it and rev the nuts off it for 30 minutes to clean it out.

    I'd rather see you doing 60 % throttle and getting it warm fast.. going at a proper speed..... and then improving your driving prediction and using the brakes less

    don't forget... brakes cost you too......

    use them less and you WILL use less fuel.

    Quote Originally Posted by Advice Trinity by Knoxville
    "The second you aren't paying attention to the tool you're using, it will take your fingers from you. It does not know sympathy." |
    "If you don't gaffer it, it will gaffer you" | "Belt and braces"

  6. #22
    Senior Member
    Join Date
    May 2014
    Posts
    768
    Thanks
    130
    Thanked
    36 times in 33 posts
    • Xlucine's system
      • Motherboard:
      • Gigabyte Z97MX Gaming 5
      • CPU:
      • i5 4690K @stock, until I upgrade my graphics
      • Memory:
      • 8GB @2133 11-11-11-27
      • Storage:
      • Crucial MX500 512GB, 2TB storage
      • Graphics card(s):
      • Gigabyte 750ti OC
      • PSU:
      • Seasonic S12G-550
      • Case:
      • Silverstone TJ08-E

    Re: How to get better mpg?

    Quote Originally Posted by Dashers View Post
    After eeking out the miles in my EV a while ago on a (for an EV) long trip, I found that aerodynamics play a far bigger role than I previously expected.

    I found that going over 50mph and you start drastically losing efficiency. My idea was to nip in behind a lorry and get a bit of slip streaming going, but if you're limiting yourself to lorry speeds, you never catch up with one to slot in!

    In my more fuel-hungry RS the big impactor has always been acceleration - not even aggressive acceleration, just slowing down for turns or traffic lights are a killer. Stonking it along at questionable speeds doesn't seem to have a major impact - maybe it's a more slippery car than the EV.

    But yeah, as above for going on a trip.

    - Reduce your weight, swap your space saver for a break down sub and a can of goo.
    - Check your tyre pressures are correct
    - Find a reputable garage with a Hunter tracking system and check your wheels are all straight (it's amazing how much fuel dragging a tyre sideways will use).
    - Check your thermostat is working correctly, as engines need to be maintained at a correct temperature to be efficient
    IMO the tyre goo is a false economy. A tyre with a hole in it can be repaired, a tyre with goo in it can't. And when you're replacing one tyre, you need to replace the other side of the axle or else the ABS will get upset (diff will get a bit hotter too, if it's a driven axle). Goo is also no good if you hit a curb and damage the rim, with the space saver that's an easy fix

  7. #23
    Senior Member kalniel's Avatar
    Join Date
    Aug 2005
    Posts
    28,378
    Thanks
    1,356
    Thanked
    2,755 times in 2,239 posts
    • kalniel's system
      • Motherboard:
      • Gigabyte X58A UD3R rev 2
      • CPU:
      • Intel i7 950
      • Memory:
      • 12gb DDR3 2000
      • Graphics card(s):
      • AMD HD7870
      • PSU:
      • XFX Pro 650W
      • Case:
      • Cooler Master HAF 912
      • Operating System:
      • Win 7 Pro x64
      • Monitor(s):
      • Dell U2311H
      • Internet:
      • O2 8mbps

    Re: How to get better mpg?

    Quote Originally Posted by Dashers View Post
    In my more fuel-hungry RS the big impactor has always been acceleration - not even aggressive acceleration, just slowing down for turns or traffic lights are a killer. Stonking it along at questionable speeds doesn't seem to have a major impact - maybe it's a more slippery car than the EV.
    Very much doubt it! It's more likely a surfeit of torque. I found the same when I had a torquey large diesel car - it was far less affected by air resistance. Which of course means they should have added a higher gear/run a more economic timing because they didn't need that much torque for the speed!

  8. #24
    Senior Member
    Join Date
    Jan 2005
    Location
    Manchester
    Posts
    2,590
    Thanks
    53
    Thanked
    96 times in 81 posts
    • Butcher's system
      • Motherboard:
      • MSI Z97 Gaming 3
      • CPU:
      • i7-4790K
      • Memory:
      • 8 GB Corsair 1866 MHz
      • Storage:
      • 120GB SSD, 240GB SSD, 2TB HDD
      • Graphics card(s):
      • MSI GTX 970
      • PSU:
      • Antec 650W
      • Case:
      • Big Black Cube!
      • Operating System:
      • Windows 7

    Re: How to get better mpg?

    Quote Originally Posted by Xlucine View Post
    IMO the tyre goo is a false economy. A tyre with a hole in it can be repaired, a tyre with goo in it can't. And when you're replacing one tyre, you need to replace the other side of the axle or else the ABS will get upset (diff will get a bit hotter too, if it's a driven axle). Goo is also no good if you hit a curb and damage the rim, with the space saver that's an easy fix
    I've had one puncture so far on my car. The goo was useless as it had a huge rip in the sidewall. I had to get recovered to a nearby garage and buy a tyre at some expense (over a barrel and all that). The irony was I was having 4 new tyres put on a week or so later, so I spent a lot of money on a tyre for it to get maybe 500 miles usage tops.


  9. #25
    Senior Member AGTDenton's Avatar
    Join Date
    Jun 2009
    Location
    Bracknell
    Posts
    1,071
    Thanks
    192
    Thanked
    128 times in 88 posts
    • AGTDenton's system
      • Motherboard:
      • ASUS P6T7 WS Supercomputer
      • CPU:
      • Intel Core i7 980
      • Memory:
      • 24GB Corsair Dominator GT
      • Storage:
      • OCZ Vector + HDDs
      • Graphics card(s):
      • Inno3D GTX 980 iChill Herculez X4 Air Boss Ultra
      • PSU:
      • Seasonic X-850W
      • Case:
      • Fractal Design Define XL
      • Operating System:
      • 10 Pro x64
      • Monitor(s):
      • BenQ
      • Internet:
      • 70MB using BT line

    Re: How to get better mpg?

    I would add:

    Dont use daylight running lights. I disabled mine and saved around 40miles to a tank each fill, I was quite surprised how much they were using.
    However, mine are older halogen bulbs, if yours are LED it wouldnt make that much difference.

    Set driving mode to ECO mode if your car has it. Sport/Performance drinks far more fuel on acceleration. Cruising is the same, however.

    Clean out your car, I often end up with work stuff litterered around the place. But you'd be surprised at just how heavy rubbish and stuff you dont need in the car are. Keep only emergency stuff, and overnight bits if long road trip. Every fuel/hotel stop clear out the rubbish.

    Dont leave AC or fans on if you dont need it - wear more or less clothes depending on the temperature.

    Turn off sub, or turn down bass on audio obviously not to a level that makes the drive boring, but your ears will soon adjust.


    Rigs:
    Main: ASUS P6T7 WS Supercomputer, i7 980, 24GB Corsair Dominator GT, OCZ Vectors + HDDs, Inno3D GTX 980 iChill Herculez X4 Air Boss Ultra, Seasonic X-850W, Fractal Design Define XL, 10 x64 Pro, Noctua DH14 + stock chassis fans

  10. #26
    I really don't care Dashers's Avatar
    Join Date
    Jun 2016
    Posts
    698
    Thanks
    18
    Thanked
    85 times in 72 posts
    • Dashers's system
      • Motherboard:
      • Gigabyte GA-X99-UD4
      • CPU:
      • Intel i7-5930K
      • Memory:
      • Corsair DDR4 2800 Quad
      • Storage:
      • Intel 750 PCIe SSD; RAID-0 x2 Samsung 850 EVO; RAID-0 x2 WD Black
      • Graphics card(s):
      • EVGA GeForce GTX 970 x2 SLI
      • PSU:
      • CoolerMaster Silent Pro M2 720W
      • Case:
      • Corsair 500R
      • Operating System:
      • Windows 10
      • Monitor(s):
      • x2 23.5" 1080 72Hz OC
      • Internet:
      • Zen FTTC

    Re: How to get better mpg?

    Quote Originally Posted by Xlucine View Post
    IMO the tyre goo is a false economy. A tyre with a hole in it can be repaired, a tyre with goo in it can't. And when you're replacing one tyre, you need to replace the other side of the axle or else the ABS will get upset (diff will get a bit hotter too, if it's a driven axle). Goo is also no good if you hit a curb and damage the rim, with the space saver that's an easy fix
    Not strictly true. I use Holts Tyre Weld, it doesn't kipper the tyre like some of the OEM stuff. Just wash it out and repair the tyre.

    http://www.halfords.com/workshop-too...tyreweld-500ml

    You're right about side-wall damage, if you have a blow out or something then no amount of goo is going to help you. But then it comes a trade off. How often, if you maintain your tyres correctly, do you have blow outs? Not driving into things at enough speed to damage things is actually surprisingly easy. If you do, you have to call recovery and likely pay over the odds on getting your tyre replaced at a local garage. But even a space saver does add a lot of weight to a car.

    I could never bring myself to remove my space-saver in my last car, but most modern cars don't come with spares any more and now none of mine do. I've been lucky and when the wife shredded a tyre she did so at home so I could just take off and down to the garage for a replacement.

    If I was going on a cross-continental tour though, I might consider adding a space saver

  11. #27
    Senior Member
    Join Date
    Jan 2005
    Location
    Manchester
    Posts
    2,590
    Thanks
    53
    Thanked
    96 times in 81 posts
    • Butcher's system
      • Motherboard:
      • MSI Z97 Gaming 3
      • CPU:
      • i7-4790K
      • Memory:
      • 8 GB Corsair 1866 MHz
      • Storage:
      • 120GB SSD, 240GB SSD, 2TB HDD
      • Graphics card(s):
      • MSI GTX 970
      • PSU:
      • Antec 650W
      • Case:
      • Big Black Cube!
      • Operating System:
      • Windows 7

    Re: How to get better mpg?

    Quote Originally Posted by AGTDenton View Post
    Dont leave AC or fans on if you dont need it - wear more or less clothes depending on the temperature.
    On the other hand, if you don't run your AC enough it will lose more gas, so it can be a false economy if you end up paying for more frequent regassing. It;s worse if like mine it has the stupid expensive gas, so can cost over £200 for a regas.

    Quote Originally Posted by Dashers View Post
    You're right about side-wall damage, if you have a blow out or something then no amount of goo is going to help you. But then it comes a trade off. How often, if you maintain your tyres correctly, do you have blow outs? Not driving into things at enough speed to damage things is actually surprisingly easy. If you do, you have to call recovery and likely pay over the odds on getting your tyre replaced at a local garage. But even a space saver does add a lot of weight to a car.
    I've never had a blow out, however the above damage was done at just 30 mph. Hitting a rock does a surprising amount of damage it turns out.

  12. #28
    Senior Member joshwa's Avatar
    Join Date
    Jul 2003
    Location
    Shef-field, UK
    Posts
    4,772
    Thanks
    88
    Thanked
    63 times in 58 posts
    • joshwa's system
      • Motherboard:
      • PC Chips M577 AT/ATX
      • CPU:
      • AMD K6-2 500Mhz
      • Memory:
      • 512mb PC100 SDRAM
      • Storage:
      • 6.4GB Samsung
      • Graphics card(s):
      • 16mb Matrox G400 Dual Head AGP
      • PSU:
      • ATX 145watt
      • Case:
      • Midi Tower AT
      • Monitor(s):
      • 27" iiyama TFT Widescreen
      • Internet:
      • Awful horrible ADSL

    Re: How to get better mpg?

    Well, after driving nearly 3000 miles around Europe, the speed I drove had the biggest impact:

    60-65mph and I got 61.9mpg
    70-75mph - 52.8-53mpg
    75-80mph - 50-54mpg
    90-100mph (Autobahn) - 46mpg

    Racing around the Nurburgring and doing lots of short journeys, 29mpg

    Tyre pressure was checked, tread is pretty decent. Better mpg was had when there was less stopping and starting, and the toll roads don't help with this, so the best mpg was had in the UK, where the lower speed limits also helped.

  13. Received thanks from:

    satrow (26-05-2017)

  14. #29
    . bledd's Avatar
    Join Date
    Jul 2003
    Posts
    1,868
    Thanks
    22
    Thanked
    133 times in 83 posts

    Re: How to get better mpg?

    Slightly over-inflate your tyres, by say 10%.
    Remove non required items from the car, they soon add up to extra weight

Page 2 of 2 FirstFirst 12

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •