Quote:
Originally Posted by Eau Rouge
seriously?
Higher rpm = increased fuel consumption.
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Power output is generally directly proportional to more fuel used. You need 30% more fuel to produce 30% more power.
Running at higher RPM also uses more fuel due to higher friction losses, but not at the same rate as the RPM increase. Running at 30% higher RPM does not necessarily burn 30% more fuel.
Since during the EPA test, redline and maximum power are not used often if at all, both would have little impact on the EPA rating.
How efficient an engine is at low power and low RPM usually translates in good EPA ratings.