Based on data from 84 vehicles, 6,364 fuel-ups and 1,854,973 miles of driving, the 2012 GMC Sierra 1500 gets a combined Avg MPG of 14.68 with a 0.08 MPG margin of error.

Any Engine Type 4.8L V8 FLEX (8) 5.3L V8 FLEX (53) 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 (42) Other (10)

Below you can see a distribution of the fuel-ups with 149 outliers (2.29%) removed.

Following shows the average MPG of each of the 84 vehicles in the system.

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• My Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2021 • 152 Fuel-ups

  Property of mgoblue94

• 15.0 Avg MPG

• Snow Storm

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Aug 2019 • 252 Fuel-ups

  Property of Ngiles79

• 11.4 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2024 • 14 Fuel-ups

  Property of LSClendenen

• 12.8 Avg MPG

• Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2018 • 87 Fuel-ups

  Property of Matthew77

• 12.9 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Dec 2023 • 32 Fuel-ups

  Property of cameron15g

• 16.5 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2024 • 7 Fuel-ups

  Property of Rugby735

• 15.0 Avg MPG

• Truck

  2012 GMC Sierra 1500 SLT 6.2L V8 FLEX Automatic 6 Speed
  Added Dec 2020 • 107 Fuel-ups

  Property of saharper

• 11.6 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Dec 2023 • 20 Fuel-ups

  Property of MaxMcQueen

• 14.3 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jul 2020 • 82 Fuel-ups

  Property of storm_5oh

• 13.0 Avg MPG

• GMC Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jul 2024 • 5 Fuel-ups

  Property of dyoung522

• 17.5 Avg MPG

• Cowboy's Cadillac

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Feb 2016 • 343 Fuel-ups

  Property of TheMayor

• 13.6 Avg MPG

• Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2024 • 3 Fuel-ups

  Property of nmbs2k

• 12.8 Avg MPG

• 2012 GMC Sierra 1500 Z71

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2016 • 247 Fuel-ups

  Property of slabshaft

• 16.2 Avg MPG

• 5.3L Z71 CCSB

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Mar 2012 • 239 Fuel-ups

  Property of willfull04

• 16.1 Avg MPG

• 12 GMC Sierra

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jun 2023 • 46 Fuel-ups

  Property of acjet88

• 12.1 Avg MPG

• 246-40

  2012 GMC Sierra 1500 SL 4.8L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Mar 2023 • 59 Fuel-ups

  Property of Brandon-Lawrence

• 14.2 Avg MPG

• GMC 2012

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed
  Added Sep 2016 • 256 Fuel-ups

  Property of masterhoser

• 14.2 Avg MPG

• Work Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2019 • 268 Fuel-ups

  Property of Jathroo

• 14.5 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2016 • 222 Fuel-ups

  Property of sicariusinferi

• 14.2 Avg MPG

• Frank The Tank

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2021 • 25 Fuel-ups

  Property of Tclechner

• 12.1 Avg MPG

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