Hi,
If they use Imperial gallons, that yields a higher number. If they convert from L/km into US gallons/mile, then we'll get "accurate" numbers. Unless Toyota has done something to really help the FE, my guess is that the 56mpg and 57mpg numbers are the Imperial gallons; since the Smart car with a 1L engine, and 50 pounds lighter than the iQ gets ~45mpg in the US.
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