Based on data from 75 vehicles, 5,329 fuel-ups and 1,569,856 miles of driving, the 2012 GMC Sierra 1500 gets a combined Avg MPG of 14.86 with a 0.09 MPG margin of error.

Any Engine Type 4.8L V8 FLEX (6) 5.3L V8 FLEX (47) 6.2L V8 FLEX (10) GAS (1) V6 GAS (1) V8 FLEX (8) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (16) Any Submodel SL (4) Denali (5) SLT (19) SLE (37) Other (10)

Below you can see a distribution of the fuel-ups with 55 outliers (1.02%) removed.

Following shows the average MPG of each of the 75 vehicles in the system.

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• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jul 2020 • 35 Fuel-ups

  Property of storm_5oh

• 14.2 Avg MPG

• Snow Storm

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Aug 2019 • 135 Fuel-ups

  Property of Ngiles79

• 11.5 Avg MPG

• Sierra

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Dec 2012 • 200 Fuel-ups

  Property of maverick17

• 16.5 Avg MPG

• Work Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2019 • 114 Fuel-ups

  Property of Jathroo

• 14.2 Avg MPG

• Pearl

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Sep 2020 • 53 Fuel-ups

  Property of Wicho5

• 10.3 Avg MPG

• Truck

  2012 GMC Sierra 1500 SLT 6.2L V8 FLEX Automatic 6 Speed
  Added Dec 2020 • 46 Fuel-ups

  Property of saharper

• 11.2 Avg MPG

• GMC 2012

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed
  Added Sep 2016 • 230 Fuel-ups

  Property of masterhoser

• 14.4 Avg MPG

• 2012 GMC Sierra SLE

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Feb 2017 • 329 Fuel-ups

  Property of WalkerSchwengler

• 14.3 Avg MPG

• 5.3L Z71 CCSB

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Mar 2012 • 192 Fuel-ups

  Property of willfull04

• 16.2 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed
  Added Jan 2018 • 43 Fuel-ups

  Property of pauljanet

• 15.3 Avg MPG

• Cowboy's Cadillac

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Feb 2016 • 212 Fuel-ups

  Property of TheMayor

• 13.6 Avg MPG

• Ricks truck

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2016 • 126 Fuel-ups

  Property of rickytwo

• 11.4 Avg MPG

• 2012 GMC Sierra 1500 Z71

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2016 • 190 Fuel-ups

  Property of slabshaft

• 16.2 Avg MPG

• Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2018 • 52 Fuel-ups

  Property of Matthew77

• 12.7 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2021 • 7 Fuel-ups

  Property of mgoblue94

• 16.1 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2016 • 206 Fuel-ups

  Property of sicariusinferi

• 14.4 Avg MPG

• Sierra

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jul 2020 • 261 Fuel-ups

  Property of pierces3693

• 16.4 Avg MPG

• GMC Sierra

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Mar 2019 • 7 Fuel-ups

  Property of bradlanouette

• 13.1 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

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