Based on data from 81 vehicles, 6,221 fuel-ups and 1,816,855 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 Work Truck

  2012 GMC Sierra 1500 SLE 4.8L V8 FLEX Automatic 4 Speed Extended Cab Pickup
  Added Aug 2018 • 4 Fuel-ups

  Property of 81tubex

• 11.9 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 4.8L V8 FLEX Automatic 4 Speed
  Added Jul 2018 • 5 Fuel-ups

  Property of Perkilf

• 10.4 Avg MPG

• Cinnamon Brown

  2012 GMC Sierra 1500 SLT Automatic 6 Speed Extended Cab Pickup
  Added May 2018 • 29 Fuel-ups

  Property of ROBOCT07

• 18.1 Avg MPG

• 4x4 Daily Drive Sierra

  2012 GMC Sierra 1500 SLE 4.8L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Oct 2012 • 174 Fuel-ups

  Property of kahman95

• 15.9 Avg MPG

• GMC Yukon Denali

  2012 GMC Sierra 1500 Denali 6.2L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 4 Fuel-ups

  Property of free_willy62

• 17.4 Avg MPG

• Sierra

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2012 • 390 Fuel-ups

  Property of jphemph

• 17.5 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2018 • 19 Fuel-ups

  Property of jory

• 16.0 Avg MPG

• GMC Sierra 1500 SLT Z71

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2017 • 15 Fuel-ups

  Property of chrisph

• 12.4 Avg MPG

• 2012 Sierra

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2017 • 16 Fuel-ups

  Property of jacksdogs

• 17.6 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2016 • 77 Fuel-ups

  Property of hawk293

• 12.8 Avg MPG

• My Sierra 1500

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

  Property of mark2889

• 17.3 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2017 • 8 Fuel-ups

  Property of txfishing

• 11.7 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jul 2019 • 9 Fuel-ups

  Property of presto86

• 4.9 Avg MPG

• 2012 Sierra Noir

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Feb 2017 • 48 Fuel-ups

  Property of MFamily

• 17.8 Avg MPG

• Truck

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2019 • 67 Fuel-ups

  Property of mjarena

• 18.3 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 4.8L V8 FLEX Automatic 4 Speed
  Added Apr 2017 • 5 Fuel-ups

  Property of mikeriverdrive

• 16.0 Avg MPG

• GMC Sierra

  2012 GMC Sierra 1500 SLE 6.2L V8 FLEX Automatic 4 Speed
  Added Mar 2017 • 124 Fuel-ups

  Property of TxTiger1962

• 15.5 Avg MPG

• Truck

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jun 2013 • 43 Fuel-ups

  Property of Travinder

• 13.8 Avg MPG

• Sierra 1500

  2012 GMC Sierra 1500 SLE 6.2L V8 FLEX Automatic 6 Speed
  Added Sep 2015 • 4 Fuel-ups

  Property of Oaks

• 14.9 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2015 • 5 Fuel-ups

  Property of isanchez315

• 12.4 Avg MPG

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