Based on data from 196 vehicles, 18,460 fuel-ups and 5,213,327 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 (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 (113)

Below you can see a distribution of the fuel-ups with 263 outliers (1.40%) removed.

Following shows the average MPG of each of the 196 vehicles in the system.

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• GMC Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Oct 2022 • 68 Fuel-ups

  Property of ArtieBar64

• 16.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 253 Fuel-ups

  Property of cbinnie22

• 15.4 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 • 282 Fuel-ups

  Property of mpg01

• 17.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed
  Added Nov 2018 • 261 Fuel-ups

  Property of epedro40

• 15.9 Avg MPG

• GMC Sierra 1500 2018

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2018 • 197 Fuel-ups

  Property of JLF52

• 18.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Feb 2024 • 63 Fuel-ups

  Property of BowManGuardian

• 16.1 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2021 • 143 Fuel-ups

  Property of gabeyoung

• 11.8 Avg MPG

• Glenn

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2020 • 318 Fuel-ups

  Property of ghcrawford

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2021 • 197 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 Jan 2018 • 172 Fuel-ups

  Property of nmason42

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2024 • 110 Fuel-ups

  Property of Mr-GreenToCleanPools

• 17.8 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2024 • 47 Fuel-ups

  Property of Jathroo

• 17.0 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Apr 2022 • 172 Fuel-ups

  Property of rtsteen

• 17.7 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 388 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 Jun 2024 • 29 Fuel-ups

  Property of deanhodder

• 17.6 Avg MPG

• Babs (Barbara) 2018 Sierra 1500 Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Nov 2024 • 16 Fuel-ups

  Property of nicklebyrd20210

• 14.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Feb 2025 • 4 Fuel-ups

  Property of WayneZzWorld93

• 13.9 Avg MPG

• Black Betty

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Dec 2018 • 348 Fuel-ups

  Property of tlawson85

• 18.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2023 • 92 Fuel-ups

  Property of Harvey4335

• 14.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2019 • 386 Fuel-ups

  Property of iNative

• 15.9 Avg MPG

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