I have been debating on getting a new truck or a 2002-2003. I have driven two different 2003's and they both had excellent power with 265 tires, but my uncle has a 2003 with only 37 on the odo and it seems anemic with it's 285 tires. What do you think could be causing my uncles's truck to seem so weak. He is looking at a programmer. Which ones have actually shown an increase in power and fuel mileage. He only gets around 17 empty on the interstate running 70-75 and that's with me driving. I can coax 19 out of a 1999 Tahoe running the same speeds.