Based on data from 176 vehicles, 12,484 fuel-ups and 3,582,660 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 16.25 with a 0.06 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (6) 5.3L V8 ELECTRIC/GAS (11) 5.3L V8 FLEX (23) 5.3L V8 GAS (87) 6.2L V8 GAS (48) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (50) Cab & Chassis - Crew Cab (1) Any Submodel Base (10) SLE (25) Denali (33) SLT (108)

Below you can see a distribution of the fuel-ups with 542 outliers (4.16%) removed.

Following shows the average MPG of each of the 176 vehicles in the system.

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• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2019 • 147 Fuel-ups

  Property of iNative

• 15.5 Avg MPG

• Glenn

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2020 • 139 Fuel-ups

  Property of ghcrawford

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 147 Fuel-ups

  Property of cbinnie22

• 16.0 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 287 Fuel-ups

  Property of jered6323

• 14.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2022 • 3 Fuel-ups

  Property of cheapguy99

• 11.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 FLEX Automatic 8 Speed
  Added Feb 2019 • 132 Fuel-ups

  Property of mpgapp

• 14.4 Avg MPG

• Sierra

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Oct 2018 • 128 Fuel-ups

  Property of ScottyR

• 14.0 Avg MPG

• 2018GMC SIERRA 4X4

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2020 • 54 Fuel-ups

  Property of jjz3

• 19.2 Avg MPG

• Black Betty

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Dec 2018 • 161 Fuel-ups

  Property of tlawson85

• 18.0 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 80 Fuel-ups

  Property of Teutonics

• 17.8 Avg MPG

• Big Red Eskimo

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Nov 2021 • 54 Fuel-ups

  Property of rkfdwc1

• 15.2 Avg MPG

• Truck

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2020 • 119 Fuel-ups

  Property of jasonbrakhage

• 14.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Mar 2022 • 41 Fuel-ups

  Property of nvolz

• 16.7 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 139 Fuel-ups

  Property of bgrinder90

• 14.1 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Oct 2021 • 33 Fuel-ups

  Property of Philly9277

• 15.6 Avg MPG

• Jolene

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jul 2020 • 97 Fuel-ups

  Property of eddiemoney

• 17.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2018 • 149 Fuel-ups

  Property of rleitht

• 15.1 Avg MPG

• 2018 GMC Sierra Denali 4x4

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 155 Fuel-ups

  Property of mpg01

• 16.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2021 • 52 Fuel-ups

  Property of riggity27

• 16.4 Avg MPG

• Sierra

  2018 GMC Sierra 1500 Denali Automatic 8 Speed Crew Cab Pickup
  Added Jul 2021 • 41 Fuel-ups

  Property of ch56vy

• 14.3 Avg MPG

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