I know alot of people want to go fast, I like speed, but i know that there has to be a way to increase our gas mileage. Any new ideas about how to do it? There is a vehicle that gets roughly 75 mpg (1000km/3L) it is a 3 cylinder in-line diesel engine with a clutch less system. So I summarize that a 4 cylinder gasoline engine should be able to get at least 40 mph regularly. So how do we do it. Just a question to all of our engine buffs out there.