Based on data from 43 vehicles, 3,528 fuel-ups and 1,169,198 miles of driving, the 2012 GMC Sierra 2500 HD gets a combined Avg MPG of 13.56 with a 0.12 MPG margin of error.

Any Engine Type 6.0L V8 FLEX (8) 6.0L V8 GAS (1) 6.6L V8 DIESEL (27) V8 DIESEL (5) Any Body Style Extended Cab Pickup (2) Crew Cab Pickup (4) Any Submodel SLE (5) WT (6) SLT (8) Denali (18) Other (6)

Below you can see a distribution of the fuel-ups with 179 outliers (4.83%) removed.

Following shows the average MPG of each of the 43 vehicles in the system.

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• GMC 2500HD

  2012 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Oct 2017 • 273 Fuel-ups

  Property of rrustong

• 14.0 Avg MPG

• Sierra HD K2500

  2012 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2016 • 344 Fuel-ups

  Property of pavkurcon

• 13.7 Avg MPG

• Denali

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Sep 2020 • 144 Fuel-ups

  Property of jerry3039

• 13.5 Avg MPG

• 2012 Gmc Sierra SLT DURAMAX

  2012 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Nov 2017 • 160 Fuel-ups

  Property of pewterformula

• 15.9 Avg MPG

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2017 • 250 Fuel-ups

  Property of avi8er82

• 14.0 Avg MPG

• Sierra 2500 HD

  2012 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Mar 2019 • 69 Fuel-ups

  Property of navy0010

• 13.6 Avg MPG

• GMC

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Feb 2022 • 35 Fuel-ups

  Property of BrendanPoston

• 14.8 Avg MPG

• Duramax

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 117 Fuel-ups

  Property of wings180

• 15.8 Avg MPG

• 2012 GMC Sierra 2500HD

  2012 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 137 Fuel-ups

  Property of bklynbullet

• 13.1 Avg MPG

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jan 2023 • 4 Fuel-ups

  Property of ddumo98

• 13.8 Avg MPG

• GMC

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2018 • 228 Fuel-ups

  Property of autodata

• 12.8 Avg MPG

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD WT 6.0L V8 FLEX Automatic 6 Speed
  Added Mar 2022 • 6 Fuel-ups

  Property of FordTough48

• 12.0 Avg MPG

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD WT 6.0L V8 FLEX Automatic 6 Speed
  Added Jan 2020 • 19 Fuel-ups

  Property of KENJUMP

• 11.4 Avg MPG

• 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

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