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Poor Fuel Mileage GMC Sierra?

Source: Yahoo! Answers

I own a 2008 GMC Sierra 1500 Crew Cab 2 Wheel Drive with 5.3L Engine with Active Fuel Management, and 3.73 Rear Axle Ratio. I had the GMC Cat Back Exhaust system added before I took delivery. I have 7,900 miles on my odometer. My fuel mileage is 12 to 13 miles per gallon. I... Read More

  • It will go up a little bit as the car is broken in more ... but at 8000 miles you aren't going to get better than that. Regrettably, new cars are much heavier than older ones due to safety features and things. So you will probably continue to get worse mileage on the new one over the old one. I have a 1990's Corolla... Read More
  • Depends on the type of driving you do and it seems that as these trucks get more mileage on them they get better. The exhaust is not going to help as much as you think it will. the active fuel management has to meet very strict conditions to engage. I would give it a little while and considering that the check engine... Read More
  • How fast are you driving? I drive a 1993 Chev with 5.7 and it gets 18-22 but I don't drive faster than 65. I let the other vehicles blow my doors in. If I kick it up above 65 the mileage goes down to around 14.
  • I'm sorry but I don't beleive you will getting any better with your fuel mileage. Be thankful for 12 to 13. I only get 9.5 with my GMC
  • That 3.73 rear is what's killing you, but it's too late now. That's OK for towing, but the low mpg is the compromise.
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In the field of full-size trucks, brand loyalty is an especially strong factor, with die-hards for the bow tie or the blue oval. But objectively, next to the F-150, the Silverado offers better steering and sharper handling, though some might like the F-150's interior design, which is more businesslike yet still upscale. Styling is a big differentiator; the Sierra has a softer design, while the other competitors have the more aggressive, faux-semi look in front. Fuel economy is a strong point for the Sierra; with the 4.8- or 5.3-liter engines, it gets better ratings in city and highway driving than all of its rivals with similar-sized engines--at a time when every mile per gallon really counts. The 2008 GMC Sierra 1500 has one or two fewer gears than the Tundra. The Tundra--especially in top-trim versions--is especially competitive with the Silverado, as it offers a comfortable, classy interior and 5.7-liter V-8 that's more powerful than GM's 6.0-liter.

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