How's it going everybody? I'm definitely not a new chevy 4x4 owner, but my latest purchase has definitely rubbed me wrong, and has me wanting to strangle the previous owner. not to mention simply trying to figure out how to get better performance and MPG's (this is the absolute worst I've ever had). So, here's my specs: 07 Chevy 1500 Crew cab; Z71; LTZ, 33x12.50x20 tires Here's several of my issues: -I get and avg of 13.5 MPG (city/hwy). Hwy I get 13-14 MPG. City I get 13-14 MPG. yes, that's correct, no change from city or hwy driving. -The power and performance in this truck really sucks. My previous '04 GMC ext cab 5.3L with oversized tires (dont recall exact size) wasn't a hot rod by any means, but you could feel some power. This truck - none whatsoever. Hwy passing speeds - when you floor it, it drops to lower gear, but barely seems to accelerate. The previous owner capped off one side of the dual exhaust muffler outlet (single in, dual out). I know this contributes a little to my issues, but how much? Would this be a major cause of my problems? Also, just some other info - at 70mph, my rpm's are a little over 2K. This seems quite high, as every previous truck Ive had ran several hundred RPM's below 2K. Any tips?