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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• Truck

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 4 Speed Crew Cab Pickup
  Added Sep 2015 • 9 Fuel-ups

  Property of Brekelmans

• 16.2 Avg MPG

• Woody Truck

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2015 • 4 Fuel-ups

  Property of Woody23

• 14.5 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Crew Cab Pickup (4 Door)
  Added Jan 2015 • 65 Fuel-ups

  Property of Jake45

• 15.3 Avg MPG

• Sierra 1500

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Crew Cab Pickup (4 Door)
  Added Jul 2015 • 4 Fuel-ups

  Property of bjboucher

• 15.2 Avg MPG

• Sierra

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Crew Cab Pickup (4 Door)
  Added Jan 2015 • 24 Fuel-ups

  Property of GodFather2u

• 13.3 Avg MPG

• My Sierra 1500

  2012 GMC Sierra 1500 SLE 5.3L FLEX V8 Automatic 6 Crew Cab Pickup (4 Door)
  Added Mar 2015 • 11 Fuel-ups

  Property of SubaChevy

• 11.8 Avg MPG

• sierra

  2012 GMC Sierra 1500 SL
  Added Dec 2013 • 43 Fuel-ups

  Property of coon

• 11.0 Avg MPG

• Work Ride

  2012 GMC Sierra 1500 SL 4.8L V8 FLEX Automatic 4 Speed Extended Cab Pickup
  Added Feb 2013 • 180 Fuel-ups

  Property of kenwoodug

• 18.9 Avg MPG

• My Fancy Golf Club Hauler

  2012 GMC Sierra 1500 FLEX V8
  Added Aug 2012 • 144 Fuel-ups

  Property of lfendr

• 15.8 Avg MPG

• 2012 GMC 1500

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

  Property of kpwaterdoc

• 10.4 Avg MPG

• 2012 Sierra 1500

  2012 GMC Sierra 1500 FLEX V8
  Added Jan 2014 • 7 Fuel-ups

  Property of BrianTKnapp

• 15.5 Avg MPG

• GMC

  2012 GMC Sierra 1500 FLEX V8
  Added Jul 2013 • 21 Fuel-ups

  Property of blazer7

• 13.9 Avg MPG

• Black Sierra

  2012 GMC Sierra 1500 FLEX V8
  Added Oct 2013 • 7 Fuel-ups

  Property of sse1990

• 11.4 Avg MPG

• sharons truck

  2012 GMC Sierra 1500 GAS
  Added Feb 2013 • 18 Fuel-ups

  Property of slazz

• 15.6 Avg MPG

• GMC Sierra

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2016 • 56 Fuel-ups

  Property of Screagle

• 18.0 Avg MPG

• GMC Sierra

  2012 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2016 • 56 Fuel-ups

  Property of Screagle

• 18.0 Avg MPG

• Grandpa

  2012 GMC Sierra 1500 GAS V6
  Added Mar 2013 • 9 Fuel-ups

  Property of TENNESSEEBEERMAN

• 18.0 Avg MPG

• 2012 GMC Sierra 4x4

  2012 GMC Sierra 1500 FLEX V8
  Added Feb 2013 • 8 Fuel-ups

  Property of evans5665

• 34.5 Avg MPG

• Black Betty

  2012 GMC Sierra 1500 FLEX V8
  Added Sep 2012 • 18 Fuel-ups

  Property of noplugs52

• 10.2 Avg MPG

• Sierra

  2012 GMC Sierra 1500 FLEX V8
  Added Oct 2012 • 6 Fuel-ups

  Property of txbubba

• 14.7 Avg MPG

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