Based on data from 187 vehicles, 16,581 fuel-ups and 4,682,233 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 (52) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (54) Any Submodel Base (12) SLE (26) Denali (37) SLT (112)

Below you can see a distribution of the fuel-ups with 240 outliers (1.43%) removed.

Following shows the average MPG of each of the 187 vehicles in the system.

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• My Sierra 1500

  2018 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2023 • 18 Fuel-ups

  Property of bsimmons86

• 13.7 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 330 Fuel-ups

  Property of Buckshot48

• 17.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Feb 2024 • 15 Fuel-ups

  Property of BowManGuardian

• 16.4 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2021 • 112 Fuel-ups

  Property of gabeyoung

• 11.8 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2019 • 377 Fuel-ups

  Property of CAHayes1109

• 13.9 Avg MPG

• Number 9

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 207 Fuel-ups

  Property of woodsmith

• 17.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Feb 2019 • 193 Fuel-ups

  Property of turbonix

• 17.5 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Apr 2024 • 4 Fuel-ups

  Property of drink2006

• 18.6 Avg MPG

• Jolene

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jul 2020 • 165 Fuel-ups

  Property of eddiemoney

• 17.0 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 • 247 Fuel-ups

  Property of mpg01

• 17.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed
  Added Nov 2018 • 223 Fuel-ups

  Property of epedro40

• 16.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2024 • 31 Fuel-ups

  Property of Mr-GreenToCleanPools

• 19.3 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 8 Speed
  Added Feb 2018 • 399 Fuel-ups

  Property of elliston61

• 20.3 Avg MPG

• Rich's Truck

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jul 2019 • 144 Fuel-ups

  Property of rcorning

• 18.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Mar 2018 • 214 Fuel-ups

  Property of chilly0999

• 16.1 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 209 Fuel-ups

  Property of ndsewall

• 16.2 Avg MPG

• Black Betty

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Dec 2018 • 300 Fuel-ups

  Property of tlawson85

• 18.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2019 • 329 Fuel-ups

  Property of iNative

• 15.7 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Apr 2022 • 150 Fuel-ups

  Property of rtsteen

• 17.7 Avg MPG

• Big Red Eskimo

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Nov 2021 • 219 Fuel-ups

  Property of rkfdwc1

• 15.3 Avg MPG

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