Based on data from 186 vehicles, 16,451 fuel-ups and 4,645,636 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 (27) 5.3L V8 GAS (91) 6.2L V8 GAS (51) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (53) Any Submodel Base (12) SLE (26) Denali (36) SLT (112)

Below you can see a distribution of the fuel-ups with 239 outliers (1.43%) removed.

Following shows the average MPG of each of the 186 vehicles in the system.

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• 2018 GMC Sierra Denali 4x4

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2018 • 243 Fuel-ups

  Property of mpg01

• 17.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Feb 2024 • 12 Fuel-ups

  Property of BowManGuardian

• 16.2 Avg MPG

• GMC Sierra 1500 2018

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2018 • 170 Fuel-ups

  Property of JLF52

• 18.7 Avg MPG

• Sierra

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Oct 2018 • 171 Fuel-ups

  Property of ScottyR

• 14.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Aug 2022 • 51 Fuel-ups

  Property of Miles_To_Go

• 15.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2018 • 143 Fuel-ups

  Property of nmason42

• 15.0 Avg MPG

• GMC

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed Crew Cab Pickup
  Added Jul 2022 • 78 Fuel-ups

  Property of jscott2126

• 15.6 Avg MPG

• Rooster

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2019 • 124 Fuel-ups

  Property of x62605

• 17.5 Avg MPG

• Number 9

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 205 Fuel-ups

  Property of woodsmith

• 17.6 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 8 Speed
  Added Feb 2018 • 396 Fuel-ups

  Property of elliston61

• 20.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2023 • 37 Fuel-ups

  Property of Harvey4335

• 15.0 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2021 • 110 Fuel-ups

  Property of gabeyoung

• 11.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Jun 2020 • 3 Fuel-ups

  Property of mjb2288

• 16.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2022 • 66 Fuel-ups

  Property of bertt34

• 15.7 Avg MPG

• Sierra

  2018 GMC Sierra 1500 Denali Automatic 8 Speed Crew Cab Pickup
  Added Jul 2021 • 91 Fuel-ups

  Property of ch56vy

• 13.6 Avg MPG

• Jimmy

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 204 Fuel-ups

  Property of cowpen

• 19.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Mar 2018 • 211 Fuel-ups

  Property of chilly0999

• 16.0 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 184 Fuel-ups

  Property of bgrinder90

• 14.0 Avg MPG

• My Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2022 • 43 Fuel-ups

  Property of cheapguy99

• 12.4 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 123 Fuel-ups

  Property of Teutonics

• 17.4 Avg MPG

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