What's the secret to retaining good gas mileage in a performance application?

[HotRoddin]

Originally Posted by Vector

I KNOW there are motors out there delivering 400 horsepower, and still get 20mpg on the highway.

There is !!! ??? You're gonna have to show me some "official" specs to get me to buy that one.

There is no question however that the MPG vs HP ratio has vastly improved in the last few years, and it's all about efficiency. The combustion chambers have been designed to burn fuel more efficiently, the fuel/air charge is metered more precicely, there is less friction, everything is lighter, there is a crapper load of little things they have done that all adds up to better fuel economy for the HP produced. The car factories all have huge Engineering staffs working on that stuff all the time. I don't think you can pin it down to any one or two things, it's a combination of lots of things.

Rod