Based on data from 112 vehicles, 8,546 fuel-ups and 2,360,854 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 280 outliers (3.17%) removed.

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

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• Brads Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Oct 2017 • 3 Fuel-ups

  Property of bwj3

• 23.9 Avg MPG

• Black Betty

  2008 GMC Sierra 1500 SLE Automatic 4 Speed
  Added Mar 2017 • 39 Fuel-ups

  Property of TheRealTexx

• 15.7 Avg MPG

• Gmc

  2008 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Aug 2015 • 5 Fuel-ups

  Property of hootmaine

• 13.8 Avg MPG

• 08 Sierra

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Jan 2022 • 179 Fuel-ups

  Property of texags06

• 14.4 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed
  Added Nov 2017 • 48 Fuel-ups

  Property of jeffcgould

• 14.1 Avg MPG

• Sierra

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Sep 2016 • 68 Fuel-ups

  Property of DN3RD

• 16.4 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 4 Speed
  Added Aug 2015 • 90 Fuel-ups

  Property of mikeyoung

• 15.5 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Dec 2015 • 108 Fuel-ups

  Property of billb1

• 14.5 Avg MPG

• Vmax

  2008 GMC Sierra 1500 SLE 6.0L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Jul 2014 • 126 Fuel-ups

  Property of ninja007

• 14.4 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Nov 2016 • 33 Fuel-ups

  Property of emunch

• 11.3 Avg MPG

• Big Red

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Jan 2010 • 225 Fuel-ups

  Property of hollerchuck

• 16.5 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed
  Added Jan 2018 • 4 Fuel-ups

  Property of Tizzony

• 13.7 Avg MPG

• GMC DENAli

  2008 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Jan 2018 • 102 Fuel-ups

  Property of MyGMCDENALI

• 14.2 Avg MPG

• GMC Sierra

  2008 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Aug 2015 • 92 Fuel-ups

  Property of carolinaelite12

• 14.3 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 6.0L V8 GAS Automatic 4 Speed
  Added Jul 2016 • 42 Fuel-ups

  Property of benstoll

• 14.2 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jul 2017 • 8 Fuel-ups

  Property of mike_flex-in_up

• 15.8 Avg MPG

• Big Sexy

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Crew Cab Pickup (4 Door)
  Added Aug 2015 • 91 Fuel-ups

  Property of Wjhogan

• 12.5 Avg MPG

• 2008 Sierra

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Nov 2017 • 316 Fuel-ups

  Property of scotthh

• 16.6 Avg MPG

• nuutron's GMC

  2008 GMC Sierra 1500 WT 4.8L V8 GAS Automatic 4 Speed Standard Cab Pickup
  Added Aug 2015 • 11 Fuel-ups

  Property of nuutron

• 15.7 Avg MPG

• Sierra

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2016 • 232 Fuel-ups

  Property of MC99

• 15.7 Avg MPG

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