Originally Posted by Forrest

Okay i have been thinking about this all day.

We will use semtex's car as a example.

Since he is putting down 330rwhp, while Driving at 65mph is his RPM lower than stock since it requires less power for him to maintain that speed?

Im a novice to the workings of the inside of the car but that is the theory that my brain came up with no idea if thats how it works.

Does the same ammount of gas get used to create all this power? If it does, doesnt that mean the engine is more efficient? then giving him better MPG?