Based on data from 195 vehicles, 18,116 fuel-ups and 5,119,841 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 15.96 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 (95) 6.2L V8 GAS (55) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (54) Any Submodel Base (12) SLE (30) Denali (41) SLT (112)

Below you can see a distribution of the fuel-ups with 255 outliers (1.39%) removed.

Following shows the average MPG of each of the 195 vehicles in the system.

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• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added May 2024 • 98 Fuel-ups

  Property of Zebby76

• 16.8 Avg MPG

• Babs (Barbara) 2018 Sierra 1500 Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Nov 2024 • 9 Fuel-ups

  Property of nicklebyrd20210

• 15.3 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 379 Fuel-ups

  Property of Buckshot48

• 17.9 Avg MPG

• Vador

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Apr 2024 • 55 Fuel-ups

  Property of drink2006

• 18.6 Avg MPG

• GMC Sierra 1500 2018

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2018 • 195 Fuel-ups

  Property of JLF52

• 18.8 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2021 • 139 Fuel-ups

  Property of gabeyoung

• 11.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jun 2024 • 21 Fuel-ups

  Property of richardcfo

• 20.4 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 • 274 Fuel-ups

  Property of mpg01

• 17.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2023 • 53 Fuel-ups

  Property of bsimmons86

• 12.7 Avg MPG

• Black Betty

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Dec 2018 • 338 Fuel-ups

  Property of tlawson85

• 18.2 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2023 • 55 Fuel-ups

  Property of Jhs4

• 14.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 FLEX Automatic 8 Speed
  Added Aug 2023 • 19 Fuel-ups

  Property of MaxBurn

• 12.9 Avg MPG

• Big Red Eskimo

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Nov 2021 • 274 Fuel-ups

  Property of rkfdwc1

• 15.5 Avg MPG

• Truck

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2020 • 199 Fuel-ups

  Property of jasonbrakhage

• 14.3 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Apr 2022 • 162 Fuel-ups

  Property of rtsteen

• 17.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2024 • 46 Fuel-ups

  Property of o_dog2003

• 16.1 Avg MPG

• Rooster

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2019 • 145 Fuel-ups

  Property of x62605

• 17.5 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 382 Fuel-ups

  Property of Godofwine7

• 15.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2018 • 232 Fuel-ups

  Property of rleitht

• 15.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2019 • 372 Fuel-ups

  Property of iNative

• 15.9 Avg MPG

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