Based on data from 193 vehicles, 17,923 fuel-ups and 5,066,367 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 (28) 5.3L V8 GAS (94) 6.2L V8 GAS (54) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (54) Any Submodel Base (12) SLE (30) Denali (40) SLT (111)

Below you can see a distribution of the fuel-ups with 246 outliers (1.35%) removed.

Following shows the average MPG of each of the 193 vehicles in the system.

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• GMC Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 230 Fuel-ups

  Property of ndsewall

• 16.0 Avg MPG

• 033

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Mar 2024 • 24 Fuel-ups

  Property of jirpol

• 15.2 Avg MPG

• GMC

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed Crew Cab Pickup
  Added Jul 2022 • 93 Fuel-ups

  Property of jscott2126

• 15.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jun 2024 • 4 Fuel-ups

  Property of blackandwhiteX6

• 17.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added May 2024 • 5 Fuel-ups

  Property of MHingley

• 16.4 Avg MPG

• GMC Sierra 1500 SLT

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jul 2018 • 50 Fuel-ups

  Property of Dirtpig

• 17.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2018 • 324 Fuel-ups

  Property of Polar800

• 13.9 Avg MPG

• Truck

  2018 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed Standard Cab Pickup
  Added May 2019 • 7 Fuel-ups

  Property of mcgannd

• 24.8 Avg MPG

• 2018GMC SIERRA 4X4

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2020 • 90 Fuel-ups

  Property of jjz3

• 19.0 Avg MPG

• 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 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

• 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

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