Based on data from 108 vehicles, 8,299 fuel-ups and 2,348,622 miles of driving, the 2008 GMC Sierra 1500 gets a combined Avg MPG of 14.10 with a 0.06 MPG margin of error.

Any Engine Type 4.3L V6 GAS (5) 4.8L V8 GAS (19) 5.3L V8 FLEX (21) 5.3L V8 GAS (32) 6.0L V8 GAS (4) 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 (21) Cab & Chassis - Extended Cab (1) Any Submodel Denali (5) WT (10) SL (11) SLT (19) SLE (44) Other (19)

Below you can see a distribution of the fuel-ups with 266 outliers (3.11%) removed.

Following shows the average MPG of each of the 108 vehicles in the system.

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• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Apr 2019 • 224 Fuel-ups

  Property of grantallen

• 11.9 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Nov 2020 • 74 Fuel-ups

  Property of Yankeeezilla

• 14.2 Avg MPG

• 246-35

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed
  Added Mar 2023 • 8 Fuel-ups

  Property of Brandon-Lawrence

• 10.5 Avg MPG

• Sierra

  2008 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Apr 2021 • 63 Fuel-ups

  Property of francmic

• 13.3 Avg MPG

• Colin Truck

  2008 GMC Sierra 1500 SLT 6.0L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Feb 2018 • 96 Fuel-ups

  Property of colinandcynthia

• 14.5 Avg MPG

• Black betty

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Jun 2022 • 42 Fuel-ups

  Property of 2012skyactiv

• 13.6 Avg MPG

• 2008 GMC Sierra 1500

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Dec 2022 • 17 Fuel-ups

  Property of tpfamily

• 16.8 Avg MPG

• 2008 GMC Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Nov 2018 • 173 Fuel-ups

  Property of IFIXEM2

• 16.1 Avg MPG

• Jesses truck

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Mar 2023 • 11 Fuel-ups

  Property of COM-Mattawa

• 14.6 Avg MPG

• Eggplant

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Oct 2020 • 40 Fuel-ups

  Property of JSGunderson

• 12.2 Avg MPG

• Dad’s Red Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Feb 2020 • 139 Fuel-ups

  Property of SonomaCorkDork

• 14.6 Avg MPG

• GMC DENAli

  2008 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 366 Fuel-ups

  Property of justgas

• 14.1 Avg MPG

• Dads Blu

  2008 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 4 Speed
  Added Aug 2019 • 73 Fuel-ups

  Property of ArsrTech

• 13.7 Avg MPG

• GMC

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Mar 2018 • 191 Fuel-ups

  Property of MHogsett

• 16.2 Avg MPG

• GMC

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Oct 2017 • 88 Fuel-ups

  Property of Chemicalfree

• 15.9 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2022 • 21 Fuel-ups

  Property of wnifong

• 13.8 Avg MPG

• Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2017 • 105 Fuel-ups

  Property of jordanGutts

• 14.4 Avg MPG

• Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jul 2014 • 144 Fuel-ups

  Property of MChap15

• 13.7 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 WT 5.3L V8 GAS Automatic 4 Speed
  Added Dec 2020 • 37 Fuel-ups

  Property of ace22398

• 14.3 Avg MPG

• Work Truck

  2008 GMC Sierra 1500 WT 4.3L V6 GAS Automatic 4 Speed Standard Cab Pickup
  Added Mar 2019 • 290 Fuel-ups

  Property of Frsmithiv

• 15.1 Avg MPG

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