Based on data from 249 vehicles, 23,838 fuel-ups and 7,133,687 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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• My Sierra 1500

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added May 2023 • 37 Fuel-ups

  Property of Kootenayguy

• 14.5 Avg MPG

• Sierra

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jan 2020 • 199 Fuel-ups

  Property of mlsthmpsn

• 14.0 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Dec 2020 • 80 Fuel-ups

  Property of Srebel92

• 13.7 Avg MPG

• 14 Sierra 5.3 4x4

  2014 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added May 2019 • 247 Fuel-ups

  Property of DanielAcosta

• 19.2 Avg MPG

• Sierra 1500 SLT

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added May 2019 • 67 Fuel-ups

  Property of Rross

• 16.2 Avg MPG

• 14 Sierra

  2014 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2022 • 4 Fuel-ups

  Property of COM-Mattawa

• 14.0 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed
  Added Jun 2022 • 9 Fuel-ups

  Property of nwwerdel

• 14.0 Avg MPG

• GMC Sierra 2014

  2014 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed Standard Cab Pickup
  Added Sep 2018 • 206 Fuel-ups

  Property of prixxjohn21

• 15.3 Avg MPG

• GMC Sierra 1500

  2014 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2021 • 81 Fuel-ups

  Property of Straussberg

• 15.5 Avg MPG

• GMC

  2014 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2014 • 253 Fuel-ups

  Property of Odoyl

• 17.0 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Dec 2021 • 38 Fuel-ups

  Property of jeffstruck

• 11.2 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Feb 2022 • 4 Fuel-ups

  Property of philwanders

• 14.6 Avg MPG

• 2014 Sierra

  2014 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Dec 2018 • 199 Fuel-ups

  Property of Muldo

• 15.0 Avg MPG

• Sierra 1500

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2017 • 264 Fuel-ups

  Property of gobluefrasier

• 16.3 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Mar 2022 • 5 Fuel-ups

  Property of dodgewal

• 14.8 Avg MPG

• Big truck

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2021 • 6 Fuel-ups

  Property of stevenmags

• 13.4 Avg MPG

• 2014 GMC

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Dec 2017 • 474 Fuel-ups

  Property of ahartman

• 15.7 Avg MPG

• Sierra

  2014 GMC Sierra 1500 SLT 5.3L FLEX V8 Automatic 6 Crew Cab Pickup (4 Door)
  Added Dec 2014 • 15 Fuel-ups

  Property of jurbin

• 17.1 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Mar 2019 • 69 Fuel-ups

  Property of joeprice2601

• 15.8 Avg MPG

• Mi Troka

  2014 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Feb 2021 • 3 Fuel-ups

  Property of sanchezcivic

• 13.9 Avg MPG

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