Based on data from 186 vehicles, 16,447 fuel-ups and 4,644,293 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 15.97 with a 0.05 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (6) 5.3L V8 ELECTRIC/GAS (10) 5.3L V8 FLEX (27) 5.3L V8 GAS (91) 6.2L V8 GAS (51) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (53) Any Submodel Base (12) SLE (26) Denali (36) SLT (112)

Below you can see a distribution of the fuel-ups with 238 outliers (1.43%) removed.

Following shows the average MPG of each of the 186 vehicles in the system.

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• GMC 1500 4x4

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2018 • 197 Fuel-ups

  Property of kiscl

• 14.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2018 • 125 Fuel-ups

  Property of rinman

• 15.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2018 • 261 Fuel-ups

  Property of e37292

• 17.0 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Oct 2021 • 76 Fuel-ups

  Property of Philly9277

• 15.2 Avg MPG

• GMC Sierra 1500 SLT

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jul 2018 • 49 Fuel-ups

  Property of Dirtpig

• 17.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2022 • 88 Fuel-ups

  Property of sierradenali6-2

• 13.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Feb 2019 • 166 Fuel-ups

  Property of mskalak

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2022 • 56 Fuel-ups

  Property of jasonellington

• 16.8 Avg MPG

• 2018 Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Oct 2021 • 59 Fuel-ups

  Property of gksills

• 18.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Mar 2022 • 95 Fuel-ups

  Property of nvolz

• 16.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Nov 2022 • 18 Fuel-ups

  Property of rosco1618

• 18.2 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2018 • 151 Fuel-ups

  Property of lordsporkton

• 14.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Mar 2021 • 37 Fuel-ups

  Property of DarkLordScott

• 16.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2022 • 12 Fuel-ups

  Property of bl9893

• 19.2 Avg MPG

• 2018 GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 180 Fuel-ups

  Property of pmhayden

• 17.1 Avg MPG

• "The Legacy" 2018 GMC Sierra SLT

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Sep 2018 • 79 Fuel-ups

  Property of Ed753

• 16.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 FLEX Automatic 8 Speed
  Added Feb 2019 • 133 Fuel-ups

  Property of mpgapp

• 14.4 Avg MPG

• 2018 Sierra Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Oct 2020 • 35 Fuel-ups

  Property of Tiger_993

• 18.2 Avg MPG

• Sierra Red

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2019 • 133 Fuel-ups

  Property of Snafujg

• 16.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Jun 2018 • 91 Fuel-ups

  Property of yt_4real

• 13.9 Avg MPG

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