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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• Gregio

  2008 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed
  Added Apr 2023 • 7 Fuel-ups

  Property of quiktekk

• 17.4 Avg MPG

• GMC DENAli

  2008 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 398 Fuel-ups

  Property of justgas

• 14.1 Avg MPG

• Black betty

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Jun 2022 • 106 Fuel-ups

  Property of 2012skyactiv

• 13.8 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 WT 4.8L V8 GAS Automatic 4 Speed
  Added Oct 2018 • 140 Fuel-ups

  Property of sierraco

• 10.0 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Sep 2024 • 12 Fuel-ups

  Property of kadenbeard

• 10.4 Avg MPG

• Brandon Derrick

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Mar 2017 • 419 Fuel-ups

  Property of agman01

• 14.8 Avg MPG

• Sierra

  2008 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Apr 2021 • 95 Fuel-ups

  Property of francmic

• 13.3 Avg MPG

• GMC

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Mar 2018 • 251 Fuel-ups

  Property of MHogsett

• 16.1 Avg MPG

• 2008 GMC Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Nov 2018 • 206 Fuel-ups

  Property of IFIXEM2

• 16.0 Avg MPG

• 246-35

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed
  Added Mar 2023 • 32 Fuel-ups

  Property of Brandon-Lawrence

• 10.5 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Nov 2020 • 106 Fuel-ups

  Property of Yankeeezilla

• 13.8 Avg MPG

• Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2017 • 125 Fuel-ups

  Property of jordanGutts

• 14.3 Avg MPG

• Colin Truck

  2008 GMC Sierra 1500 SLT 6.0L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Feb 2018 • 121 Fuel-ups

  Property of colinandcynthia

• 14.5 Avg MPG

• Dads Blu

  2008 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 4 Speed
  Added Aug 2019 • 90 Fuel-ups

  Property of ArsrTech

• 13.9 Avg MPG

• GMC

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Oct 2017 • 101 Fuel-ups

  Property of Chemicalfree

• 15.5 Avg MPG

• Eggplant

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Oct 2020 • 66 Fuel-ups

  Property of JSGunderson

• 12.5 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2022 • 48 Fuel-ups

  Property of wnifong

• 14.1 Avg MPG

• Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jul 2014 • 175 Fuel-ups

  Property of MChap15

• 13.4 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed
  Added Jan 2024 • 35 Fuel-ups

  Property of davidhoover

• 13.5 Avg MPG

• Sierra

  2008 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Sep 2024 • 83 Fuel-ups

  Property of Sev4Life

• 14.6 Avg MPG

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