If my car is 56% better on fuel than can I say this?

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smokingwheels
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If my car goes twice the distance on the same amount of fuel, doing twice the distance the friction and wind resistance is double.

Can I say my engine uses fuel 4 times more efficiently?
Or is it only double?

My thinking behind it comes from Ohms law, if you double the voltage you get 4 times the power to the same load.
 
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D H said:
It is only double. You are double-booking.

Ok thanks