I have been pretty happy with my 4.3. Lowered on 22's I'm getting 20+ to the gallon, towing a car to Kentucky from South GA recently I averaged around 15 mpg, and the transmission got a little warm going through the mountain grades but overall she towed like a champ, only real thing I'm missing is the exhaust note but I'm pretty happy with the exhaust I have on it now, definitely no replacement for the nasty v8 sound though