Based on data from 112 vehicles, 8,542 fuel-ups and 2,359,972 miles of driving, the 2008 GMC Sierra 1500 gets a combined Avg MPG of 14.01 with a 0.06 MPG margin of error.

Any Engine Type 4.3L V6 GAS (3) 4.8L V8 GAS (22) 5.3L V8 FLEX (22) 5.3L V8 GAS (33) 6.0L V8 GAS (5) 6.2L V8 GAS (5) V6 GAS (2) V8 FLEX (1) V8 GAS (14) Any Body Style Standard Cab Pickup (5) Extended Cab Pickup (4) Crew Cab Pickup (23) Cab & Chassis - Extended Cab (1) Any Submodel Denali (5) WT (8) SL (12) SLT (20) SLE (48) Other (19)

Below you can see a distribution of the fuel-ups with 279 outliers (3.16%) removed.

Following shows the average MPG of each of the 112 vehicles in the system.

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• GMC SIERRA

  2008 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Feb 2020 • 20 Fuel-ups

  Property of LOS13

• 13.0 Avg MPG

• Sierra

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Dec 2018 • 149 Fuel-ups

  Property of ibirtch

• 14.3 Avg MPG

• GMC Sierra

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Aug 2016 • 233 Fuel-ups

  Property of tommy1

• 12.4 Avg MPG

• Big Red

  2008 GMC Sierra 1500 WT 4.3L V6 GAS Automatic 4 Speed Standard Cab Pickup
  Added Jun 2019 • 16 Fuel-ups

  Property of Wicho5

• 11.1 Avg MPG

• GMC

  2008 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed
  Added Sep 2016 • 188 Fuel-ups

  Property of thefloormat

• 13.3 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Jan 2020 • 26 Fuel-ups

  Property of Rschif856

• 10.7 Avg MPG

• Pickup

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added May 2018 • 119 Fuel-ups

  Property of cnelan

• 15.5 Avg MPG

• GMC Truck 4x4 Crew Cab

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Sep 2018 • 126 Fuel-ups

  Property of jjz3

• 15.3 Avg MPG

• Truck

  2008 GMC Sierra 1500 WT 4.3L V6 GAS Automatic 4 Speed Standard Cab Pickup
  Added Jan 2016 • 134 Fuel-ups

  Property of Gchodak

• 15.0 Avg MPG

• Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Jul 2019 • 3 Fuel-ups

  Property of fastford19

• 16.7 Avg MPG

• GMC Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Mar 2018 • 47 Fuel-ups

  Property of Evkan

• 13.6 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Aug 2018 • 40 Fuel-ups

  Property of Robbins19

• 11.9 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Nov 2017 • 23 Fuel-ups

  Property of TdI03

• 14.1 Avg MPG

• Haul It!

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Apr 2018 • 305 Fuel-ups

  Property of pcotto87

• 14.6 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 WT 4.8L V8 GAS Automatic 4 Speed
  Added Dec 2018 • 20 Fuel-ups

  Property of Iwonka

• 15.7 Avg MPG

• Pickup

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Mar 2017 • 92 Fuel-ups

  Property of LittleDannytheDog

• 13.8 Avg MPG

• My Blue Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Feb 2018 • 27 Fuel-ups

  Property of TonyReichel

• 13.3 Avg MPG

• 2008 GMC Sierra

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Nov 2017 • 218 Fuel-ups

  Property of Roy2Chin

• 12.2 Avg MPG

• Retired Denali

  2008 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Feb 2016 • 288 Fuel-ups

  Property of mmstone24

• 13.1 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Apr 2017 • 143 Fuel-ups

  Property of greybeardbiker

• 13.5 Avg MPG

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