not sure you did that right. it isn't at all obvious when fuel is in the denominator so lets flip it.
in your scenario car A(10mpg) gets .1 gpm (gallons/mile)
and car B(20mpg) gets .05 gpm.
so @ 10k miles a year they would use 1000 and 500 gallons respectively.
so 2% of that would be ~20 gallons and 10 gallons respectively "saved per year".
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WINDMILLS DO NOT WORK THAT WAY!!!
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