2008 GMC Sierra K15

Truck Regular
GMC Sierra K15 2008
16MPG Combined
6 Trims
← 2007 2008 2009 →
Updated February 27, 2026

Looking at the 2008 GMC Sierra K15? This Truck offers 14–16 combined MPG depending on trim and comes with 6 available configurations. We break down the specs, safety data, and how it compares to the competition.

2008 GMC Sierra K15 Specifications

SpecValue
Combined MPG14–16 combined MPG depending on trim
City MPG14
Highway MPG19
Body StyleTruck
Fuel TypeRegular
DriveAWD/4WD
Available Trims6

Available Trims

TrimMPG (City/Hwy/Combined)EngineTransmission
Auto14/18/154.3L 6cylAutomatic 4-spd
Auto14/18/164.8L 8cylAutomatic 4-spd
Auto14/19/165.3L 8cylAutomatic 4-spd
Auto13/17/146.0L 8cylAutomatic 4-spd
Auto14/19/165.3L 8cylAutomatic 4-spd
Auto12/18/146.2L 8cylAutomatic 6-spd

Annual Fuel Cost

Based on EPA estimates, the 2008 GMC Sierra K15 costs approximately $3,083 per year in fuel. This assumes 15,000 miles driven annually and current fuel prices.

Compare the 2008 GMC Sierra K15

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