Based on data from 261 vehicles, 26,035 fuel-ups and 7,826,058 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 (20) 5.3L V8 FLEX (173) 6.2L V8 GAS (27) GAS (2) V6 GAS (6) V8 GAS (24) Any Body Style Standard Cab Pickup (3) Extended Cab Pickup (19) Crew Cab Pickup (49) Cab & Chassis - Crew Cab (2) Any Submodel Base (14) Denali (21) SLE (94) SLT (96) Other (36)

Below you can see a distribution of the fuel-ups with 1173 outliers (4.31%) removed.

Following shows the average MPG of each of the 261 vehicles in the system.

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• Sierra

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jan 2025 • 340 Fuel-ups

  Property of Mthompson

• 14.3 Avg MPG

• GMC sierra allterrain

  2014 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Feb 2018 • 315 Fuel-ups

  Property of jayner86

• 11.5 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2018 • 224 Fuel-ups

  Property of Vrooom7979

• 14.6 Avg MPG

• 2014 GMC Sierra

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Apr 2019 • 228 Fuel-ups

  Property of hoffman720

• 13.8 Avg MPG

• 2014 GMC

  2014 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Jan 2024 • 22 Fuel-ups

  Property of Toddskia

• 15.0 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Apr 2025 • 20 Fuel-ups

  Property of Chuck_Yager

• 11.8 Avg MPG

• Sierra 1500

  2014 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Dec 2023 • 445 Fuel-ups

  Property of BMooyaso

• 18.9 Avg MPG

• 14 Sierra

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Apr 2018 • 363 Fuel-ups

  Property of Bassbuster88

• 15.3 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 6 Speed
  Added Feb 2024 • 33 Fuel-ups

  Property of Bward7

• 14.0 Avg MPG

• 2-2014 GMC Sierra

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2017 • 595 Fuel-ups

  Property of Larry942

• 15.8 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 Denali 5.3L V8 FLEX Automatic 6 Speed
  Added Jan 2025 • 32 Fuel-ups

  Property of Notsew96

• 14.5 Avg MPG

• My Sierra 1500 SLT

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2023 • 89 Fuel-ups

  Property of jamesg88

• 17.4 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2023 • 68 Fuel-ups

  Property of DLoewen

• 14.4 Avg MPG

• Truck

  2014 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Aug 2018 • 1180 Fuel-ups

  Property of shuckeba

• 11.2 Avg MPG

• Larry's GMC Sierra Crew Cab

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Sep 2016 • 503 Fuel-ups

  Property of lundrider

• 15.7 Avg MPG

• George

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jun 2020 • 419 Fuel-ups

  Property of GeorgeParker

• 19.6 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2020 • 462 Fuel-ups

  Property of capnmo

• 14.2 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2024 • 42 Fuel-ups

  Property of truckerjosh

• 15.0 Avg MPG

• Dale

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Jan 2025 • 445 Fuel-ups

  Property of anousackns

• 15.7 Avg MPG

• My Sierra 1500

  2014 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2025 • 6 Fuel-ups

  Property of JHaag3683

• 14.0 Avg MPG

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