Re: My 2012 GMC Sierra
If you can, wait to see what the MPG is estimated at for the new trucks. They are already saying better then the current models. Best you're going to get is 18-20mpg with the current model, but thats in a reg. cab short box, with a 5.3/6l90e and a grandpa foot. In a crew cab you're going to be around 15-17mpg avg.
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2020 Silverado Trail Boss - 6.2/10spd
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