I had the Superchips flashpaq in my 08 4.7 and I barely noticed a thing. I bought it mainly to try and help out gas mileage, but it actually made it worse...and no I didn't drive more aggressively. I tried several setups, including the 87, 93, and mileage xs tune. I'm not saying that it doesn't work, but it's hard to notice a 10-20 hp gain on such a heavy vehicle. Does anybody have a programmer that actually works to increase fuel economy?
That's very surprising. Mine is like night and day. It's like 61 hp and 67lbft for that year on the 93 tune BTW. That's definitely noticeable, at least on my truck it is. Dropped a second in the 1/4 mile on the tune alone.