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Originally Posted by 1953drtelco  I own a 2005 with a LBZ mouthpiece. I'm getting at least 13 mpg (Hand Calculated) towing my boat...approx 6500 lb. I tow at max 65 mph, but my truck still has the stock tires and stock height. On the freeway without towing anything I average over 20 mpg driving at 70 mph plus. I purchased my 05 used and luckily I purchased an extended warranty. The so called great Allison transmission self destructed within 2K miles. At least most of the cost of repairs are covered, and really can't complain since I have no idea how the truck was driven before I purchased it. | I would suspect you have an aftermarket tune on your ecm. 1, tranny going south, 2, 20 mpg. Never read of a stock lly getting that mileage. Yes with mods, not stock. You could have one and not know it being you bought it used. Dic=lie o meter.
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05 GMC Sierra, 3500, lly, 4x4, CCLB, dually, LBZ mouthpiece, Hook'em Horns cai mod. EGR bocked, 235X85. 2006 Mobile Suites 32TK3 5th wheel rv, 15,600 lbs. |