2014 GMC Sierra C15

Truck Flex Fuel
GMC Sierra C15 2014
20MPG Combined
3 Trims
← 2013 2014 2015 →
Updated February 27, 2026

The 2014 GMC Sierra C15 Truck provides 17–20 combined MPG depending on trim. We’ve compiled EPA fuel economy data, NHTSA safety ratings, and recall history so you can make an informed decision.

2014 GMC Sierra C15 Specifications

SpecValue
Combined MPG17–20 combined MPG depending on trim
City MPG18
Highway MPG23
Body StyleTruck
Fuel TypeFlex Fuel
DriveRWD
Available Trims3

Available Trims

TrimMPG (City/Hwy/Combined)EngineTransmission
Auto16/23/195.3L 8cylAutomatic 6-spd
Auto18/23/204.3L 6cylAutomatic 6-spd
Auto15/21/176.2L 8cylAutomatic 6-spd

Annual Fuel Cost

Based on EPA estimates, the 2014 GMC Sierra C15 costs approximately $2,366 per year in fuel. This assumes 15,000 miles driven annually and current fuel prices.

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