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By heavy on
2007 Chevrolet Silverado 1500 LT2 4dr Crew Cab 4WD 5.8 ft. SB (5.3L 8cyl 4A)
My 2007 Silverado Z71 4x4 has a good ride. it pulls a little to left, has wind noise in upper driver's side door seal, and is getting 14.7 mpg on the highway. I have the 5.3 iron block with the fuel saving 4/8 cyl 8 cyl. on demand. Was told if any aftermarket parts were installed to help mpg it would void the powertrain warranty. Break in point was between 3-5000 miles. Also when braking hard you have to use force to manuver around an object to overcome computer.