Based on data from 195 vehicles, 18,322 fuel-ups and 5,176,147 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 15.95 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 258 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 Dec 2021 • 194 Fuel-ups

  Property of riggity27

• 14.8 Avg MPG

• Glenn

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2020 • 314 Fuel-ups

  Property of ghcrawford

• 15.0 Avg MPG

• Rooster

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2019 • 148 Fuel-ups

  Property of x62605

• 17.5 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 385 Fuel-ups

  Property of Buckshot48

• 17.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2018 • 236 Fuel-ups

  Property of rleitht

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Mar 2018 • 254 Fuel-ups

  Property of chilly0999

• 16.5 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 385 Fuel-ups

  Property of Godofwine7

• 15.9 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 • 279 Fuel-ups

  Property of mpg01

• 17.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added May 2024 • 105 Fuel-ups

  Property of Zebby76

• 16.8 Avg MPG

• Truck

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2020 • 202 Fuel-ups

  Property of jasonbrakhage

• 14.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2024 • 54 Fuel-ups

  Property of o_dog2003

• 15.8 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2024 • 42 Fuel-ups

  Property of Jathroo

• 16.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2019 • 382 Fuel-ups

  Property of iNative

• 15.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2024 • 102 Fuel-ups

  Property of Mr-GreenToCleanPools

• 18.0 Avg MPG

• Vador

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Apr 2024 • 61 Fuel-ups

  Property of drink2006

• 18.4 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Extended Cab Pickup
  Added May 2018 • 475 Fuel-ups

  Property of joenrox

• 16.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2023 • 88 Fuel-ups

  Property of Harvey4335

• 15.0 Avg MPG

• Black Betty

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Dec 2018 • 343 Fuel-ups

  Property of tlawson85

• 18.2 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 200 Fuel-ups

  Property of bgrinder90

• 14.0 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2023 • 59 Fuel-ups

  Property of Jhs4

• 14.1 Avg MPG

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