I really, really want one of these! I actually don't even care what the performance is like - if it has mileage that high I could drive to Perth and back without refueling.
BMW says its new Euro Mini D diesel will see the high side of 72.4 mpg, by way of its efficient oil burner paired with hybrid-like technologies. Those include brake-regeneration, which uses an intelligent alternator controller that detaches the generator draw from the engine on acceleration and uses engine spool-down on deceleration to recharge the battery. It also includes (on manual-transmission cars) a stop-start function that kills and restarts the engine rather than idle in neutral.
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