Based on data from 113 vehicles, 8,711 fuel-ups and 2,405,481 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 284 outliers (3.16%) removed.

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

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• 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

• Chema Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Mar 2023 • 35 Fuel-ups

  Property of COM-Mattawa

• 17.0 Avg MPG

• GMC

  2008 GMC Sierra 1500 SLT 6.0L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Oct 2023 • 94 Fuel-ups

  Property of Boconnor303

• 12.3 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

• Esteban's pickup

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Cab & Chassis - Extended Cab
  Added Oct 2022 • 15 Fuel-ups

  Property of COM-Mattawa

• 11.4 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 WT 5.3L V8 GAS Automatic 4 Speed
  Added Dec 2020 • 40 Fuel-ups

  Property of ace22398

• 14.2 Avg MPG

• Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jun 2023 • 21 Fuel-ups

  Property of Elpimpo1

• 14.4 Avg MPG

• Dad’s Red Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Feb 2020 • 162 Fuel-ups

  Property of SonomaCorkDork

• 14.8 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed
  Added Feb 2016 • 301 Fuel-ups

  Property of badmoon692004

• 16.2 Avg MPG

• My Sierra 1500

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

  Property of cbever

• 18.5 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Mar 2023 • 5 Fuel-ups

  Property of ClarkJ

• 16.1 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Apr 2019 • 227 Fuel-ups

  Property of grantallen

• 12.0 Avg MPG

• My Sierra 1500

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

  Property of Bishop9409

• 14.4 Avg MPG

• Red Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Aug 2017 • 395 Fuel-ups

  Property of kblunt

• 14.6 Avg MPG

• Truck

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Oct 2017 • 260 Fuel-ups

  Property of glruff

• 13.9 Avg MPG

• Beater Sierra

  2008 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 4 Speed
  Added Apr 2022 • 13 Fuel-ups

  Property of DubSuburban

• 12.2 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed
  Added Jun 2022 • 4 Fuel-ups

  Property of terry1658

• 12.8 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 WT 4.3L V6 GAS Automatic 4 Speed
  Added Mar 2021 • 5 Fuel-ups

  Property of hhudson26

• 13.7 Avg MPG

• Denali

  2008 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2015 • 218 Fuel-ups

  Property of slatejoh

• 5.9 Avg MPG

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