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2015 8-speed Silverado/Sierra fuel economy set at 21mpg highway


Zane
  • By Zane Merva

    Executive Editor, GM-Trucks.com

    10/13/2014

     

    Despite an official announcement or press release, the official fuel economy figures for GM's new 6.2L & 8-speed transmission seem to finally be out in the open.

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

 

 

 

View attachment: 2015MPG.jpg

(Thanks to gone_fishing for this graphic)

 

 


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