Based on data from 99 vehicles, 7,531 fuel-ups and 2,123,643 miles of driving, the 2008 GMC Sierra 1500 gets a combined Avg MPG of 14.11 with a 0.06 MPG margin of error.

Any Engine Type 4.3L V6 GAS (4) 4.8L V8 GAS (17) 5.3L V8 FLEX (19) 5.3L V8 GAS (28) 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 (22) Any Submodel Denali (5) WT (9) SL (11) SLT (17) SLE (38) Other (19)

Below you can see a distribution of the fuel-ups with 254 outliers (3.26%) removed.

Following shows the average MPG of each of the 99 vehicles in the system.

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• My Sierra 1500

  2008 GMC Sierra 1500 WT 5.3L V8 GAS Automatic 4 Speed
  Added Dec 2020 • 11 Fuel-ups

  Property of ace22398

• 14.6 Avg MPG

• 2008 GMC Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Nov 2018 • 123 Fuel-ups

  Property of IFIXEM2

• 16.3 Avg MPG

• Work Truck

  2008 GMC Sierra 1500 WT 4.3L V6 GAS Automatic 4 Speed Standard Cab Pickup
  Added Mar 2019 • 200 Fuel-ups

  Property of Frsmithiv

• 15.2 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed
  Added Feb 2016 • 244 Fuel-ups

  Property of badmoon692004

• 16.3 Avg MPG

• Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2017 • 80 Fuel-ups

  Property of jordanGutts

• 14.4 Avg MPG

• GMC Sierra 1500

  2008 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Jan 2018 • 103 Fuel-ups

  Property of JeffreyChurch

• 13.6 Avg MPG

• Truck

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jul 2014 • 127 Fuel-ups

  Property of MChap15

• 13.8 Avg MPG

• Brandon Derrick

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Mar 2017 • 347 Fuel-ups

  Property of agman01

• 14.9 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Aug 2017 • 312 Fuel-ups

  Property of kblunt

• 14.5 Avg MPG

• Sierra

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Apr 2021 • 8 Fuel-ups

  Property of francmic

• 13.7 Avg MPG

• GMC

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed
  Added Nov 2018 • 233 Fuel-ups

  Property of jakirchoff

• 12.7 Avg MPG

• Dads Blu

  2008 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 4 Speed
  Added Aug 2019 • 38 Fuel-ups

  Property of ArsrTech

• 12.7 Avg MPG

• Eggplant

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Oct 2020 • 13 Fuel-ups

  Property of JSGunderson

• 12.3 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Nov 2020 • 29 Fuel-ups

  Property of Yankeeezilla

• 15.1 Avg MPG

• GMC DENAli

  2008 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Mar 2017 • 304 Fuel-ups

  Property of justgas

• 14.2 Avg MPG

• Colin Truck

  2008 GMC Sierra 1500 SLT 6.0L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Feb 2018 • 59 Fuel-ups

  Property of colinandcynthia

• 14.5 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Apr 2019 • 179 Fuel-ups

  Property of grantallen

• 12.1 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Feb 2020 • 49 Fuel-ups

  Property of SonomaCorkDork

• 14.4 Avg MPG

• GMC SIERRA

  2008 GMC Sierra 1500 SLE 4.8L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Feb 2020 • 19 Fuel-ups

  Property of LOS13

• 12.6 Avg MPG

• Truck

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Oct 2017 • 253 Fuel-ups

  Property of glruff

• 13.9 Avg MPG

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