Late last night, a GM-Trucks.com member noticed that the 2015 Silverado fuel economy numbers had been updated at fueleconomy.gov.
Only available with the 420-horsepower 6.2L V8 engine, GM's new 8-speed will net Silverado and Sierra owners 1-additional MPG in both city and highway driving. We will report on the "official" numbers if and when the company releases them publicly.
Compared side by side to the 2014 6-speed
(Thanks to gone_fishing for this graphic)
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