Based on data from 50 vehicles, 4,345 fuel-ups and 1,412,400 miles of driving, the 2012 GMC Sierra 2500 HD gets a combined Avg MPG of 13.57 with a 0.10 MPG margin of error.

Any Engine Type 6.0L V8 FLEX (11) 6.0L V8 GAS (4) 6.6L V8 DIESEL (28) V8 DIESEL (5) Any Body Style Extended Cab Pickup (2) Crew Cab Pickup (5) Cab & Chassis - Crew Cab (1) Any Submodel SLE (7) WT (7) SLT (12) Denali (18) Other (6)

Below you can see a distribution of the fuel-ups with 187 outliers (4.13%) removed.

Following shows the average MPG of each of the 50 vehicles in the system.

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• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2019 • 76 Fuel-ups

  Property of jwp51819

• 15.5 Avg MPG

• Denali HD

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2016 • 204 Fuel-ups

  Property of maaiman

• 15.2 Avg MPG

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2017 • 45 Fuel-ups

  Property of strattonshan

• 15.4 Avg MPG

• 2012 Sierra 2500 HD

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2017 • 89 Fuel-ups

  Property of TheDon81

• 14.5 Avg MPG

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2017 • 141 Fuel-ups

  Property of tirogers

• 13.4 Avg MPG

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed
  Added Apr 2019 • 10 Fuel-ups

  Property of FoxcreteBH

• 10.1 Avg MPG

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Oct 2017 • 32 Fuel-ups

  Property of evanmoore

• 15.6 Avg MPG

• Sierra

  2012 GMC Sierra 2500 HD SLT Automatic 6 Speed
  Added Jul 2018 • 144 Fuel-ups

  Property of rtforbed

• 13.8 Avg MPG

• GMC Sierra 2500 HD

  2012 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2017 • 32 Fuel-ups

  Property of Rabbitn88

• 11.9 Avg MPG

• 2012 Sierra 2500 HD

  2012 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 32 Fuel-ups

  Property of smokinu454

• 17.2 Avg MPG

• 2012 Work truck

  2012 GMC Sierra 2500 HD WT 6.0L V8 FLEX Automatic 6 Speed
  Added May 2018 • 5 Fuel-ups

  Property of Jason35

• 12.4 Avg MPG

• Wild Bill

  2012 GMC Sierra 2500 HD WT 6.0L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Aug 2015 • 253 Fuel-ups

  Property of lnthomp

• 12.7 Avg MPG

• GMC 2012 Denali

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2016 • 316 Fuel-ups

  Property of tacoma7583

• 13.7 Avg MPG

• FrostByte

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Mar 2017 • 15 Fuel-ups

  Property of Flexspeed

• 11.6 Avg MPG

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2017 • 10 Fuel-ups

  Property of TheGodfather2010

• 14.1 Avg MPG

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2017 • 9 Fuel-ups

  Property of JKovalcik

• 15.6 Avg MPG

• Mad Max

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Feb 2015 • 108 Fuel-ups

  Property of MNMoose

• 14.6 Avg MPG

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD WT 6.0L V8 FLEX Automatic 6 Speed
  Added Jan 2016 • 18 Fuel-ups

  Property of aps241

• 10.5 Avg MPG

• Lml

  2012 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Nov 2020 • 3 Fuel-ups

  Property of sickdiesel

• 14.1 Avg MPG

• 1188

  2012 GMC Sierra 2500 HD WT 6.0L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Nov 2015 • 22 Fuel-ups

  Property of BigDCompanies

• 10.1 Avg MPG

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