Quote:
Originally Posted by Red Bread
Of course I got 7 mpg on a tank of gas in an STI (US 2.5l) once, so it's not like going to a four will necessarily improve mileage numbers.
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The difference in efficiency on a displacement or cylinder basis is going to be negligible. The specific fuel consumption (pounds of fuel per HP produced) is roughly the same engine to engine. It is more a function of having to use that HP. The more you use, the more fuel you have to burn from any engine. Nothing is free.