Based on data from 180 vehicles, 14,649 fuel-ups and 4,147,269 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 16.02 with a 0.06 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (6) 5.3L V8 ELECTRIC/GAS (10) 5.3L V8 FLEX (25) 5.3L V8 GAS (88) 6.2L V8 GAS (50) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (51) Any Submodel Base (11) SLE (25) Denali (35) SLT (109)

Below you can see a distribution of the fuel-ups with 215 outliers (1.45%) removed.

Following shows the average MPG of each of the 180 vehicles in the system.

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• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2021 • 80 Fuel-ups

  Property of gabeyoung

• 12.0 Avg MPG

• Jimmy

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 172 Fuel-ups

  Property of cowpen

• 19.1 Avg MPG

• Big Red Eskimo

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Nov 2021 • 140 Fuel-ups

  Property of rkfdwc1

• 15.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2018 • 119 Fuel-ups

  Property of rinman

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2018 • 284 Fuel-ups

  Property of Polar800

• 14.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2022 • 35 Fuel-ups

  Property of bertt34

• 16.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2018 • 167 Fuel-ups

  Property of wmdahler

• 17.2 Avg MPG

• Number 9

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 175 Fuel-ups

  Property of woodsmith

• 17.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2018 • 233 Fuel-ups

  Property of e37292

• 16.9 Avg MPG

• GMC Sierra 1500 2018

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2018 • 143 Fuel-ups

  Property of JLF52

• 18.7 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 8 Speed
  Added Feb 2018 • 346 Fuel-ups

  Property of elliston61

• 20.4 Avg MPG

• Glenn

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2020 • 208 Fuel-ups

  Property of ghcrawford

• 14.9 Avg MPG

• 2018 GMC Sierra Denali 4x4

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2018 • 198 Fuel-ups

  Property of mpg01

• 16.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2022 • 20 Fuel-ups

  Property of cheapguy99

• 13.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2022 • 76 Fuel-ups

  Property of sierradenali6-2

• 13.9 Avg MPG

• Jolene

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jul 2020 • 139 Fuel-ups

  Property of eddiemoney

• 17.1 Avg MPG

• Truck

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2020 • 156 Fuel-ups

  Property of jasonbrakhage

• 14.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2019 • 232 Fuel-ups

  Property of iNative

• 15.6 Avg MPG

• Truck

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added May 2018 • 147 Fuel-ups

  Property of DrAwesome

• 16.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed
  Added Nov 2018 • 175 Fuel-ups

  Property of epedro40

• 16.3 Avg MPG

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