Based on data from 81 vehicles, 6,215 fuel-ups and 1,815,100 miles of driving, the 2012 GMC Sierra 1500 gets a combined Avg MPG of 14.69 with a 0.08 MPG margin of error.

Any Engine Type 4.8L V8 FLEX (9) 5.3L V8 FLEX (49) 6.2L V8 FLEX (11) GAS (1) V6 GAS (1) V8 FLEX (8) Any Body Style Extended Cab Pickup (5) Crew Cab Pickup (19) Any Submodel WT (1) SL (6) Denali (6) SLT (19) SLE (39) Other (10)

Below you can see a distribution of the fuel-ups with 141 outliers (2.22%) removed.

Following shows the average MPG of each of the 81 vehicles in the system.

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• Sierra

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Dec 2012 • 228 Fuel-ups

  Property of maverick17

• 16.6 Avg MPG

• 246-38

  2012 GMC Sierra 1500 SL 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Mar 2023 • 7 Fuel-ups

  Property of Brandon-Lawrence

• 9.7 Avg MPG

• Ricks truck

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2016 • 149 Fuel-ups

  Property of rickytwo

• 11.2 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLT 6.2L V8 FLEX Automatic 6 Speed
  Added Jun 2019 • 14 Fuel-ups

  Property of angry_sq5

• 16.4 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed
  Added Jan 2018 • 61 Fuel-ups

  Property of pauljanet

• 15.2 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Aug 2021 • 3 Fuel-ups

  Property of jstrickland1028

• 13.8 Avg MPG

• Sierra

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2020 • 264 Fuel-ups

  Property of pierces3693

• 16.4 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2020 • 50 Fuel-ups

  Property of propainter

• 13.5 Avg MPG

• GMC Crew

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Aug 2016 • 246 Fuel-ups

  Property of Mavis500

• 14.5 Avg MPG

• Sierra

  2012 GMC Sierra 1500 SLE 4.8L V8 FLEX
  Added Aug 2019 • 66 Fuel-ups

  Property of 70RagTop

• 14.6 Avg MPG

• KING COBRA

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2020 • 231 Fuel-ups

  Property of jake8702

• 14.7 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SL 5.3L V8 FLEX Automatic 4 Speed
  Added Jan 2018 • 139 Fuel-ups

  Property of danebeck

• 14.4 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2019 • 56 Fuel-ups

  Property of jocortez

• 14.2 Avg MPG

• GMC

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Nov 2019 • 5 Fuel-ups

  Property of dpickett63

• 23.0 Avg MPG

• Joe's GMC Sierra

  2012 GMC Sierra 1500 SLT 6.2L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2012 • 309 Fuel-ups

  Property of slyck14

• 14.0 Avg MPG

• Sierra

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Jun 2019 • 12 Fuel-ups

  Property of Jmfeagin

• 18.8 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SL 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Feb 2018 • 35 Fuel-ups

  Property of waynehughes

• 16.2 Avg MPG

• GMC

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jan 2018 • 84 Fuel-ups

  Property of pauljanet

• 10.7 Avg MPG

• GMC Sierra SLE

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Nov 2017 • 48 Fuel-ups

  Property of kscowden

• 16.5 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2017 • 32 Fuel-ups

  Property of shanepauley

• 14.4 Avg MPG

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