Based on data from 80 vehicles, 6,059 fuel-ups and 1,762,874 miles of driving, the 2012 GMC Sierra 1500 gets a combined Avg MPG of 14.71 with a 0.08 MPG margin of error.

Any Engine Type 4.8L V8 FLEX (8) 5.3L V8 FLEX (50) 6.2L V8 FLEX (10) GAS (1) V6 GAS (1) V8 FLEX (8) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (18) Any Submodel WT (1) Denali (5) SL (6) SLT (19) SLE (39) Other (10)

Below you can see a distribution of the fuel-ups with 57 outliers (0.93%) removed.

Following shows the average MPG of each of the 80 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 • 41 Fuel-ups

  Property of mgoblue94

• 15.0 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 WT 4.8L V8 FLEX Automatic 6 Speed
  Added Jun 2022 • 46 Fuel-ups

  Property of fatdadsgarage

• 16.7 Avg MPG

• GMC Sierra

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed
  Added Mar 2019 • 31 Fuel-ups

  Property of bradlanouette

• 14.6 Avg MPG

• GMC 2012

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed
  Added Sep 2016 • 248 Fuel-ups

  Property of masterhoser

• 14.3 Avg MPG

• Pearl

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Sep 2020 • 127 Fuel-ups

  Property of Wicho5

• 10.7 Avg MPG

• Frank The Tank

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2021 • 19 Fuel-ups

  Property of Tclechner

• 12.3 Avg MPG

• Cowboy's Cadillac

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Feb 2016 • 289 Fuel-ups

  Property of TheMayor

• 13.5 Avg MPG

• Work Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2019 • 216 Fuel-ups

  Property of Jathroo

• 14.5 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jul 2020 • 55 Fuel-ups

  Property of storm_5oh

• 13.6 Avg MPG

• Sierra

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Dec 2012 • 222 Fuel-ups

  Property of maverick17

• 16.6 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2016 • 217 Fuel-ups

  Property of sicariusinferi

• 14.3 Avg MPG

• 246-40

  2012 GMC Sierra 1500 SL 4.8L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Mar 2023 • 11 Fuel-ups

  Property of Brandon-Lawrence

• 15.6 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

• 5.3L Z71 CCSB

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Mar 2012 • 215 Fuel-ups

  Property of willfull04

• 16.1 Avg MPG

• Snow Storm

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Aug 2019 • 189 Fuel-ups

  Property of Ngiles79

• 11.4 Avg MPG

• Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2018 • 77 Fuel-ups

  Property of Matthew77

• 12.8 Avg MPG

• Truck

  2012 GMC Sierra 1500 SLT 6.2L V8 FLEX Automatic 6 Speed
  Added Dec 2020 • 81 Fuel-ups

  Property of saharper

• 11.5 Avg MPG

• 2012 GMC Sierra 1500 Z71

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

  Property of slabshaft

• 16.2 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

• 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

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