Originally Posted by RSK Property Maintenance
The more power you have the less you push the throttle to maintain speed, and accelerate, therefore the engine doesn't have to work as hard and you get better fuel economy.
That's one of the funniest things I've ever read. It takes FUEL to make power, period. It's possible to make an engine more efficient by improving intake and exhaust as well as adjusting injection timing. But to get more hp, especially the really hot tunes it takes more fuel. Everyone I've talked to that has chipped a truck for more power really likes it but they admit that mpg is the first thing to go once the power is turned up.