2015 GMC Sierra K15 Cab Chassis

Special Purpose Vehicle 4WD Flex Fuel
GMC Sierra K15 Cab Chassis 2015
18MPG Combined
3 Trims
2015 2016 →
Updated February 27, 2026

The 2015 GMC Sierra K15 Cab Chassis is a Special Purpose Vehicle 4WD that delivers 17–18 combined MPG depending on trim. Here’s everything you need to know about this vehicle, from fuel economy to safety ratings.

2015 GMC Sierra K15 Cab Chassis Specifications

SpecValue
Combined MPG17–18 combined MPG depending on trim
City MPG16
Highway MPG20
Body StyleSpecial Purpose Vehicle 4WD
Fuel TypeFlex Fuel
Drive4WD
Available Trims3

Available Trims

TrimMPG (City/Hwy/Combined)EngineTransmission
Auto15/19/175.3L 8cylAutomatic 6-spd
Auto15/19/175.3L 8cylAutomatic 6-spd
Auto16/20/184.3L 6cylAutomatic 6-spd

Annual Fuel Cost

Based on EPA estimates, the 2015 GMC Sierra K15 Cab Chassis costs approximately $2,550 per year in fuel. This assumes 15,000 miles driven annually and current fuel prices.

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