Based on data from 50 vehicles, 4,298 fuel-ups and 1,399,336 miles of driving, the 2012 GMC Sierra 2500 HD gets a combined Avg MPG of 13.58 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 182 outliers (4.06%) removed.

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

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• GMC

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added May 2018 • 276 Fuel-ups

  Property of autodata

• 12.6 Avg MPG

• Slim Jim

  2012 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Dec 2024 • 4 Fuel-ups

  Property of JStevenG

• 11.4 Avg MPG

• GMC

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Feb 2022 • 84 Fuel-ups

  Property of BrendanPoston

• 14.6 Avg MPG

• Texas

  2012 GMC Sierra 2500 HD SLT 6.0L V8 GAS Automatic 6 Speed Cab & Chassis - Crew Cab
  Added Jan 2024 • 35 Fuel-ups

  Property of raltendorf

• 9.1 Avg MPG

• Sierra 2500 HD

  2012 GMC Sierra 2500 HD SLE 6.0L V8 FLEX Automatic 6 Speed
  Added Nov 2023 • 25 Fuel-ups

  Property of Ind-Mtber77

• 11.3 Avg MPG

• Denali

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Sep 2020 • 211 Fuel-ups

  Property of jerry3039

• 13.9 Avg MPG

• Sierra HD K2500

  2012 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed
  Added Aug 2016 • 400 Fuel-ups

  Property of pavkurcon

• 13.8 Avg MPG

• GMC 2500HD

  2012 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Oct 2017 • 303 Fuel-ups

  Property of rrustong

• 13.9 Avg MPG

• 2012 Gmc Sierra SLT DURAMAX

  2012 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 6 Speed Crew Cab Pickup
  Added Jan 2025 • 203 Fuel-ups

  Property of pewterformula

• 15.7 Avg MPG

• 2012 GMC Sierra 2500HD

  2012 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
  Added Sep 2016 • 148 Fuel-ups

  Property of bklynbullet

• 13.0 Avg MPG

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
  Added Jun 2017 • 309 Fuel-ups

  Property of avi8er82

• 14.3 Avg MPG

• 00 2012 Chugs 2500hd

  2012 GMC Sierra 2500 HD WT 6.0L V8 GAS Automatic 6 Speed
  Added Apr 2024 • 34 Fuel-ups

  Property of saxy415

• 10.1 Avg MPG

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD SLE 6.0L V8 GAS Automatic 6 Speed
  Added Nov 2023 • 44 Fuel-ups

  Property of doitrightdad

• 10.3 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

• My Sierra 2500 HD

  2012 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Sep 2024 • 132 Fuel-ups

  Property of Dennis-391

• 12.5 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 • 180 Fuel-ups

  Property of pewterformula

• 15.8 Avg MPG

• Sierra 2500 HD

  2012 GMC Sierra 2500 HD SLT 6.0L V8 FLEX Automatic 6 Speed
  Added Mar 2019 • 74 Fuel-ups

  Property of navy0010

• 13.7 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

• 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

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