Yeah, to 80MPH apparently.
Diesels are not good for stop start traffic & short journies! Many modern diesels have a Diesel Particulate Filter (DPF) and they need long journies to burn off all the crap they capture. Without regular long journies they clog up and cost £1000s+ to replace. Ask any owner of a diesel car who does a lot of stop start driving and limited mileage a year, they will soon become experts in the matter....
Modern diesels also run under obscene amounts of pressure and need turbos to get anything realistic out of them, both expensive if things go wrong.
Even the best modern diesels struggle to get above 30odd mpg in traffic, I can get 50mpg on the motorways, but nothing above 32mpg in traffic.
Diesel is also more expensive, more so in the US I imagine with them being so unfamilar with it (I guess there)
Somewhat irrelevant, but I remember (not personally, I wasn't around then ) the London Taxis were using those Land Rover 10J engines but because of the amount of time spent idling, the timing belt was stretching, damaging the engines.
I think HEXUS has used the UK MPG for the diesel vs the US MPG for the petrol so I doubt it gets twice the MPG. Feel free to correct me if I'm wrong.
IMHO however they should be using hybrid tech already. Hybrids really boost efficiency in city driving due to the stop-start low speed nature of the driving. The motors recharge the batteries when braking so the wasted fuel braking is massively reduced. Accelerating even quite briskly at low speeds does not use much power so that can come entirely from the motors.
If they then used a hybrid diesel like the new citroen thingy then the particulate filter is not an issue. Engine off for a long time, car running on battery, battery gets low, engine on at middle RPM under load to recharge battery for 10-15 mins at a time=clean DPF (diesel particulate filter)
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