Based on data from 81 vehicles, 6,216 fuel-ups and 1,815,401 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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• 246-40

  2012 GMC Sierra 1500 SL 4.8L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Mar 2023 • 55 Fuel-ups

  Property of Brandon-Lawrence

• 14.6 Avg MPG

• Snow Storm

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Aug 2019 • 227 Fuel-ups

  Property of Ngiles79

• 11.4 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2021 • 126 Fuel-ups

  Property of mgoblue94

• 14.8 Avg MPG

• 5.3L Z71 CCSB

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Mar 2012 • 230 Fuel-ups

  Property of willfull04

• 16.1 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2024 • 4 Fuel-ups

  Property of LSClendenen

• 13.5 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 WT 4.8L V8 FLEX Automatic 6 Speed
  Added Jun 2022 • 84 Fuel-ups

  Property of fatdadsgarage

• 16.5 Avg MPG

• 12 GMC Sierra

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jun 2023 • 44 Fuel-ups

  Property of acjet88

• 12.2 Avg MPG

• Work Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2019 • 254 Fuel-ups

  Property of Jathroo

• 14.5 Avg MPG

• Cowboy's Cadillac

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Feb 2016 • 332 Fuel-ups

  Property of TheMayor

• 13.6 Avg MPG

• Frank The Tank

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2021 • 23 Fuel-ups

  Property of Tclechner

• 12.1 Avg MPG

• Truck

  2012 GMC Sierra 1500 SLT 6.2L V8 FLEX Automatic 6 Speed
  Added Dec 2020 • 99 Fuel-ups

  Property of saharper

• 11.5 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 4.8L V8 FLEX Automatic 4 Speed
  Added Dec 2023 • 19 Fuel-ups

  Property of cameron15g

• 16.2 Avg MPG

• 2012 GMC Sierra 1500 Z71

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2016 • 243 Fuel-ups

  Property of slabshaft

• 16.2 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Dec 2023 • 11 Fuel-ups

  Property of MaxMcQueen

• 13.2 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jul 2020 • 76 Fuel-ups

  Property of storm_5oh

• 13.1 Avg MPG

• GMC 2012

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed
  Added Sep 2016 • 255 Fuel-ups

  Property of masterhoser

• 14.2 Avg MPG

• Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2018 • 85 Fuel-ups

  Property of Matthew77

• 12.8 Avg MPG

• Pearl

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Sep 2020 • 143 Fuel-ups

  Property of Wicho5

• 10.6 Avg MPG

• 2012 GMC Sierra SLE

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Feb 2017 • 433 Fuel-ups

  Property of WalkerSchwengler

• 14.3 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2016 • 220 Fuel-ups

  Property of sicariusinferi

• 14.3 Avg MPG

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