2011 GMC Sierra C15

Truck Regular
GMC Sierra C15 2011
17MPG Combined
4 Trims
← 2010 2011 2012 →
Updated February 27, 2026

The 2011 GMC Sierra C15 is a Truck that delivers 14–17 combined MPG depending on trim. Here’s everything you need to know about this vehicle, from fuel economy to safety ratings.

2011 GMC Sierra C15 Specifications

SpecValue
Combined MPG14–17 combined MPG depending on trim
City MPG15
Highway MPG21
Body StyleTruck
Fuel TypeRegular
DriveRWD
Available Trims4

Available Trims

TrimMPG (City/Hwy/Combined)EngineTransmission
Auto15/20/174.3L 6cylAutomatic 4-spd
Auto15/21/175.3L 8cylAutomatic 6-spd
Auto14/19/164.8L 8cylAutomatic 4-spd
Auto12/18/146.2L 8cylAutomatic 6-spd

Annual Fuel Cost

Based on EPA estimates, the 2011 GMC Sierra C15 costs approximately $2,775 per year in fuel. This assumes 15,000 miles driven annually and current fuel prices.

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