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They won't be able to run tests for that until they've completed the redesign to meet US safety and emissions standards. Both of those will affect either the weight of the car or the power of the engine, both of which will affect the final MPG.
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I'm more interested in knowing what the top speed will be; i.e., yes it can hit 70MPH, but that's going downhill with a stiff tailwind. Personally, I wouldn't mind that -- I'd only be using it to go in town and on the secondary roads, so I wouldn't need to go over 60.