Based on data from 194 vehicles, 19,130 fuel-ups and 5,404,535 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 15.94 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 (29) 5.3L V8 GAS (93) 6.2L V8 GAS (55) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (51) Any Submodel Base (12) SLE (31) Denali (41) SLT (110)

Below you can see a distribution of the fuel-ups with 272 outliers (1.40%) removed.

Following shows the average MPG of each of the 194 vehicles in the system.

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• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jun 2025 • 10 Fuel-ups

  Property of bkiefat918

• 13.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2019 • 423 Fuel-ups

  Property of iNative

• 16.1 Avg MPG

• Big Red Eskimo

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Nov 2021 • 320 Fuel-ups

  Property of rkfdwc1

• 15.6 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2024 • 74 Fuel-ups

  Property of Jathroo

• 17.1 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 • 294 Fuel-ups

  Property of mpg01

• 17.1 Avg MPG

• Vador

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Apr 2024 • 84 Fuel-ups

  Property of drink2006

• 18.2 Avg MPG

• Jimmy

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 249 Fuel-ups

  Property of cowpen

• 19.0 Avg MPG

• GMC Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Oct 2022 • 76 Fuel-ups

  Property of ArtieBar64

• 16.4 Avg MPG

• Truck

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added May 2018 • 193 Fuel-ups

  Property of DrAwesome

• 16.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2024 • 143 Fuel-ups

  Property of Mr-GreenToCleanPools

• 17.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 FLEX Automatic 8 Speed
  Added Aug 2023 • 26 Fuel-ups

  Property of MaxBurn

• 12.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Mar 2018 • 275 Fuel-ups

  Property of chilly0999

• 16.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added May 2024 • 129 Fuel-ups

  Property of Zebby76

• 16.4 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jun 2018 • 143 Fuel-ups

  Property of JDubz313

• 15.5 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Apr 2022 • 185 Fuel-ups

  Property of rtsteen

• 17.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2021 • 216 Fuel-ups

  Property of riggity27

• 14.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Feb 2024 • 89 Fuel-ups

  Property of BowManGuardian

• 14.9 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2019 • 483 Fuel-ups

  Property of CAHayes1109

• 14.0 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 412 Fuel-ups

  Property of Buckshot48

• 17.9 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 402 Fuel-ups

  Property of Godofwine7

• 15.9 Avg MPG

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