Chevy Silverado and GMC Sierra Real World MPG Numbers

116 messages, Last post on Aug 23, 2009 at 6:14 PM

#115 of 116 Re: Better Mileage! [eaubes] by eck_95z71 Jun 08, 2009 (12:20 am)
Replying to: eaubes (Feb 28, 2007 2:22 pm) I drive a 95 GMC Sierra Z71 with an old school fuel injected 350 with LS1 heads, a k&n intake and poweraid throttle body. Even tho its the original engine(minus the heads) and has more than 188,000 miles, it recently dynoed at 394 ponies. I mostly drive hiway and gravel roads and its been gettin close to 21 mpg and around 19 in town. My question to all you GM guys out there is how come the newer, lighter, mostly aluminum engines with better power ratings get worse mileage? My father owns a 96 Silverado as a daily driver and averages 17 mpg hiway with the 5.7 Vortec. This just shows how a few mods which cost close to nothing (bought heads from friend who totalled 01 Z28 for $50) can repeatedly show results on the hiway and still has the power to tear up my 33 inch BFG"s in the mud!
#116 of 116 Re: Anybody?? [cac4] by 2doorpost Aug 23, 2009 (6:14 pm)
Replying to: cac4 (Apr 22, 2009 5:46 pm) 2008 Longbed 1/2 ton - no a/c with the V6. Windows up or down on the freeway- 20MPG.