Based on data from 110 vehicles, 8,313 fuel-ups and 2,298,789 miles of driving, the 2008 GMC Sierra 1500 gets a combined Avg MPG of 14.02 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 (20) 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 (22) Cab & Chassis - Extended Cab (1) Any Submodel Denali (5) WT (8) SL (12) SLT (19) SLE (47) Other (19)

Below you can see a distribution of the fuel-ups with 268 outliers (3.12%) removed.

Following shows the average MPG of each of the 110 vehicles in the system.

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• GMC DENAli

  2008 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 381 Fuel-ups

  Property of justgas

• 14.1 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Nov 2020 • 96 Fuel-ups

  Property of Yankeeezilla

• 13.9 Avg MPG

• Colin Truck

  2008 GMC Sierra 1500 SLT 6.0L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Feb 2018 • 112 Fuel-ups

  Property of colinandcynthia

• 14.5 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed
  Added Jan 2024 • 21 Fuel-ups

  Property of davidhoover

• 13.1 Avg MPG

• Eggplant

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Oct 2020 • 56 Fuel-ups

  Property of JSGunderson

• 12.3 Avg MPG

• GMC

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Mar 2018 • 211 Fuel-ups

  Property of MHogsett

• 16.2 Avg MPG

• GMC

  2008 GMC Sierra 1500 SLT 6.0L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Oct 2023 • 59 Fuel-ups

  Property of Boconnor303

• 12.5 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2022 • 36 Fuel-ups

  Property of wnifong

• 13.9 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

• Brandon Derrick

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Mar 2017 • 408 Fuel-ups

  Property of agman01

• 14.8 Avg MPG

• Black betty

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Jun 2022 • 84 Fuel-ups

  Property of 2012skyactiv

• 13.4 Avg MPG

• Jesus truck

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Mar 2023 • 26 Fuel-ups

  Property of COM-Mattawa

• 17.7 Avg MPG

• Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jul 2014 • 164 Fuel-ups

  Property of MChap15

• 13.5 Avg MPG

• Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2017 • 118 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 • 81 Fuel-ups

  Property of francmic

• 13.2 Avg MPG

• 2008 GMC Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Nov 2018 • 193 Fuel-ups

  Property of IFIXEM2

• 16.0 Avg MPG

• GMC

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Oct 2017 • 94 Fuel-ups

  Property of Chemicalfree

• 15.6 Avg MPG

• Dads Blu

  2008 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 4 Speed
  Added Aug 2019 • 84 Fuel-ups

  Property of ArsrTech

• 13.8 Avg MPG

• Gregio

  2008 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed
  Added Apr 2023 • 5 Fuel-ups

  Property of quiktekk

• 15.3 Avg MPG

• 246-35

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

  Property of Brandon-Lawrence

• 10.6 Avg MPG

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