Based on data from 112 vehicles, 8,542 fuel-ups and 2,359,972 miles of driving, the 2008 GMC Sierra 1500 gets a combined Avg MPG of 14.01 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 (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 (5) Extended Cab Pickup (4) Crew Cab Pickup (23) Cab & Chassis - Extended Cab (1) Any Submodel Denali (5) WT (8) SL (12) SLT (20) SLE (48) Other (19)

Below you can see a distribution of the fuel-ups with 279 outliers (3.16%) removed.

Following shows the average MPG of each of the 112 vehicles in the system.

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• My Sierra 1500

  2008 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 4 Speed
  Added Oct 2015 • 40 Fuel-ups

  Property of torchred

• 14.3 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SLE
  Added May 2016 • 3 Fuel-ups

  Property of cesardrm

• 7.5 Avg MPG

• GMC Sierra

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Jun 2016 • 35 Fuel-ups

  Property of lpeters

• 16.1 Avg MPG

• 2008 Sierra 1500

  2008 GMC Sierra 1500 WT 5.3L V8 FLEX Automatic 4 Speed
  Added Feb 2016 • 15 Fuel-ups

  Property of jhoffer

• 16.5 Avg MPG

• My Sierra 1500

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed
  Added Feb 2016 • 11 Fuel-ups

  Property of kttyson1

• 14.5 Avg MPG

• Silver Ghost

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed Standard Cab Pickup
  Added Mar 2015 • 19 Fuel-ups

  Property of ParisTNDude

• 16.2 Avg MPG

• VortecMax

  2008 GMC Sierra 1500 SLT 6.0L V8 GAS Automatic 4 Extended Cab Pickup (4 Door)
  Added May 2013 • 337 Fuel-ups

  Property of Koeck

• 12.0 Avg MPG

• Truck!

  2008 GMC Sierra 1500 SLE 5.3L GAS V8 Automatic 4 Extended Cab Pickup (4 Door)
  Added Dec 2014 • 32 Fuel-ups

  Property of Cale

• 15.9 Avg MPG

• GMC SIERRA

  2008 GMC Sierra 1500 GAS V6
  Added Sep 2012 • 31 Fuel-ups

  Property of tkeatts

• 18.6 Avg MPG

• Jimmy

  2008 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed Standard Cab Pickup
  Added Mar 2014 • 19 Fuel-ups

  Property of ParisTNDude

• 18.2 Avg MPG

• Sierra

  2008 GMC Sierra 1500 SLT 4.8L GAS V8 Automatic 4 Standard Cab Pickup (2 Door)
  Added Nov 2014 • 5 Fuel-ups

  Property of casepuller900

• 14.5 Avg MPG

• TheTruck

  2008 GMC Sierra 1500 SLE 5.3L FLEX V8 Automatic 4 Crew Cab Pickup (4 Door)
  Added Nov 2014 • 3 Fuel-ups

  Property of nnag

• 13.2 Avg MPG

• GMC Sierra 5.3L V8 2WD 4 Door

  2008 GMC Sierra 1500 GAS V8
  Added Jan 2014 • 38 Fuel-ups

  Property of nickgust44

• 15.4 Avg MPG

• Sierra

  2008 GMC Sierra 1500 GAS V8
  Added Feb 2014 • 6 Fuel-ups

  Property of Cordanim

• 20.2 Avg MPG

• Sierra

  2008 GMC Sierra 1500 GAS V8
  Added Mar 2013 • 19 Fuel-ups

  Property of fightenfire

• 11.4 Avg MPG

• Sierra Ext

  2008 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Aug 2016 • 79 Fuel-ups

  Property of Mavis500

• 14.2 Avg MPG

• Big Black

  2008 GMC Sierra 1500 GAS V8
  Added Jan 2014 • 3 Fuel-ups

  Property of conflux

• 12.1 Avg MPG

• GMC 1500

  2008 GMC Sierra 1500 GAS V6
  Added Dec 2013 • 4 Fuel-ups

  Property of calhoun86

• 13.6 Avg MPG

• sierra

  2008 GMC Sierra 1500
  Added Jul 2013 • 14 Fuel-ups

  Property of jstratton655

• 13.7 Avg MPG

• jason

  2008 GMC Sierra 1500 GAS V8
  Added Sep 2012 • 24 Fuel-ups

  Property of runslot

• 15.4 Avg MPG

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