Based on data from 113 vehicles, 8,753 fuel-ups and 2,416,202 miles of driving, the 2008 GMC Sierra 1500 gets a combined Avg MPG of 13.99 with a 0.05 MPG margin of error.

Any Engine Type 4.3L V6 GAS (3) 4.8L V8 GAS (23) 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 (6) Extended Cab Pickup (4) Crew Cab Pickup (23) Cab & Chassis - Extended Cab (1) Any Submodel Denali (5) WT (9) SL (12) SLT (20) SLE (48) Other (19)

Below you can see a distribution of the fuel-ups with 286 outliers (3.16%) removed.

Following shows the average MPG of each of the 113 vehicles in the system.

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• Colin Truck

  2008 GMC Sierra 1500 SLT 6.0L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Feb 2018 • 129 Fuel-ups

  Property of colinandcynthia

• 14.4 Avg MPG

• GMC

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Mar 2018 • 260 Fuel-ups

  Property of MHogsett

• 16.1 Avg MPG

• 2008 GMC Sierra 1500

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Dec 2022 • 27 Fuel-ups

  Property of tpfamily

• 15.8 Avg MPG

• Sierra

  2008 GMC Sierra 1500 WT 4.8L V8 GAS Automatic 4 Speed Standard Cab Pickup
  Added Feb 2025 • 84 Fuel-ups

  Property of ToadilyToad

• 13.1 Avg MPG

• GMC DENAli

  2008 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 409 Fuel-ups

  Property of justgas

• 14.1 Avg MPG

• Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2017 • 128 Fuel-ups

  Property of jordanGutts

• 14.4 Avg MPG

• Sierra

  2008 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Apr 2021 • 110 Fuel-ups

  Property of francmic

• 13.3 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Nov 2020 • 113 Fuel-ups

  Property of Yankeeezilla

• 13.7 Avg MPG

• Gregio

  2008 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed
  Added Apr 2023 • 26 Fuel-ups

  Property of quiktekk

• 14.7 Avg MPG

• Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jul 2014 • 180 Fuel-ups

  Property of MChap15

• 13.4 Avg MPG

• Eggplant

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Oct 2020 • 75 Fuel-ups

  Property of JSGunderson

• 12.4 Avg MPG

• 2008 GMC Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Nov 2018 • 219 Fuel-ups

  Property of IFIXEM2

• 15.9 Avg MPG

• Brandon Derrick

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Mar 2017 • 430 Fuel-ups

  Property of agman01

• 14.7 Avg MPG

• Black betty

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Jun 2022 • 126 Fuel-ups

  Property of 2012skyactiv

• 13.7 Avg MPG

• Dads Blu

  2008 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 4 Speed
  Added Aug 2019 • 94 Fuel-ups

  Property of ArsrTech

• 13.9 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2022 • 51 Fuel-ups

  Property of wnifong

• 14.5 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Sep 2024 • 14 Fuel-ups

  Property of kadenbeard

• 9.1 Avg MPG

• 246-35

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed
  Added Mar 2023 • 34 Fuel-ups

  Property of Brandon-Lawrence

• 10.5 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 WT 4.8L V8 GAS Automatic 4 Speed
  Added Oct 2018 • 146 Fuel-ups

  Property of sierraco

• 10.1 Avg MPG

• GMC

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed
  Added Nov 2018 • 367 Fuel-ups

  Property of jakirchoff

• 12.7 Avg MPG

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