Based on data from 249 vehicles, 23,836 fuel-ups and 7,133,160 miles of driving, the 2014 GMC Sierra 1500 gets a combined Avg MPG of 15.62 with a 0.04 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (19) 5.3L V8 FLEX (164) 6.2L V8 GAS (26) GAS (2) V6 GAS (6) V8 GAS (24) Any Body Style Standard Cab Pickup (3) Extended Cab Pickup (16) Crew Cab Pickup (45) Cab & Chassis - Crew Cab (2) Any Submodel Base (14) Denali (19) SLE (90) SLT (90) Other (36)

Below you can see a distribution of the fuel-ups with 496 outliers (2.04%) removed.

Following shows the average MPG of each of the 249 vehicles in the system.

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• Lifted Summit

  2014 GMC Sierra 1500 GAS V8
  Added Apr 2014 • 44 Fuel-ups

  Property of liftedSLTsierra

• 15.8 Avg MPG

• Kawasaki KLR 650

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 3 Fuel-ups

  Property of crashper

• 38.8 Avg MPG

• My Truck

  2014 GMC Sierra 1500 GAS V8
  Added Apr 2014 • 17 Fuel-ups

  Property of 2014sierra62

• 18.6 Avg MPG

• John's truck

  2014 GMC Sierra 1500 SLE 5.3L FLEX V8 Automatic 6 Crew Cab Pickup (4 Door)
  Added Aug 2014 • 11 Fuel-ups

  Property of JohnDavid

• 17.0 Avg MPG

• Huntin' Truck

  2014 GMC Sierra 1500 GAS
  Added Jan 2014 • 24 Fuel-ups

  Property of HKaiser

• 16.1 Avg MPG

• 2014 Gmc

  2014 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Sep 2021 • 20 Fuel-ups

  Property of dr67dave

• 21.3 Avg MPG

• GMC Sierra V6 4x4 dbl

  2014 GMC Sierra 1500 GAS V6
  Added Jun 2014 • 11 Fuel-ups

  Property of GarrettP

• 18.9 Avg MPG

• Sierra

  2014 GMC Sierra 1500 GAS V8
  Added Jul 2013 • 77 Fuel-ups

  Property of mhadley

• 18.4 Avg MPG

• Stealth GMC

  2014 GMC Sierra 1500 GAS V8
  Added Feb 2014 • 14 Fuel-ups

  Property of Jamesdee

• 12.9 Avg MPG

• GMC Sierra 2014

  2014 GMC Sierra 1500 GAS V6
  Added May 2014 • 27 Fuel-ups

  Property of nbseymour

• 20.5 Avg MPG

• GMC Sierra

  2014 GMC Sierra 1500 GAS V8
  Added Apr 2014 • 20 Fuel-ups

  Property of JAM10238

• 16.7 Avg MPG

• GMC Truck

  2014 GMC Sierra 1500 GAS V6
  Added Apr 2014 • 3 Fuel-ups

  Property of lecho77

• 22.2 Avg MPG

• Sierra

  2014 GMC Sierra 1500 GAS V8
  Added Mar 2014 • 7 Fuel-ups

  Property of geekgirl171

• 16.6 Avg MPG

• Sierra

  2014 GMC Sierra 1500 GAS V6
  Added May 2014 • 3 Fuel-ups

  Property of ujsierra

• 17.4 Avg MPG

• My Fav Truck

  2014 GMC Sierra 1500 GAS V8
  Added Feb 2014 • 23 Fuel-ups

  Property of dnt

• 18.8 Avg MPG

• rubby red

  2014 GMC Sierra 1500 GAS V8
  Added Jun 2014 • 3 Fuel-ups

  Property of blueskie

• 1.9 Avg MPG

• SR1

  2014 GMC Sierra 1500 GAS V8
  Added Jun 2014 • 11 Fuel-ups

  Property of davidbsjunkmail

• 19.5 Avg MPG

• red truck

  2014 GMC Sierra 1500 SLE 5.3L FLEX V8 Automatic 6 Extended Cab Pickup (4 Door)
  Added Jul 2014 • 4 Fuel-ups

  Property of dr67dave

• 20.9 Avg MPG

• Dan's GMC

  2014 GMC Sierra 1500
  Added Mar 2014 • 3 Fuel-ups

  Property of dec355

• 17.7 Avg MPG

• Sierra

  2014 GMC Sierra 1500 GAS V8
  Added Jan 2014 • 5 Fuel-ups

  Property of streetglide7

• 17.3 Avg MPG

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