I've got a freind who installed a bulldog system into his 7.3 ford f-350, he really likes it a lot. Claims when he wants power he gets it, when he whants economy he gets it. I think thats worth investigating. I know i'm going to on my next truck. He claims it saves him a ton on fuel.Not to hi-jack this thread too much, but since it's come up - is Hypertech the way to go for programming HD trucks.....or what about others like BullyDog or whatever?