Based on data from 196 vehicles, 18,652 fuel-ups and 5,265,131 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 15.93 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 266 outliers (1.41%) removed.

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

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• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Feb 2024 • 66 Fuel-ups

  Property of BowManGuardian

• 16.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2024 • 69 Fuel-ups

  Property of o_dog2003

• 15.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2024 • 32 Fuel-ups

  Property of deanhodder

• 17.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Feb 2025 • 10 Fuel-ups

  Property of WayneZzWorld93

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Feb 2019 • 223 Fuel-ups

  Property of turbonix

• 17.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2024 • 113 Fuel-ups

  Property of Mr-GreenToCleanPools

• 17.8 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2019 • 460 Fuel-ups

  Property of CAHayes1109

• 14.0 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2023 • 64 Fuel-ups

  Property of Jhs4

• 14.0 Avg MPG

• Black Betty

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Dec 2018 • 357 Fuel-ups

  Property of tlawson85

• 18.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2018 • 231 Fuel-ups

  Property of wmdahler

• 17.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 257 Fuel-ups

  Property of cbinnie22

• 15.4 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 392 Fuel-ups

  Property of Godofwine7

• 15.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed
  Added Nov 2018 • 267 Fuel-ups

  Property of epedro40

• 15.9 Avg MPG

• Babs (Barbara) 2018 Sierra 1500 Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Nov 2024 • 20 Fuel-ups

  Property of nicklebyrd20210

• 13.9 Avg MPG

• Truck

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2020 • 209 Fuel-ups

  Property of jasonbrakhage

• 14.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jun 2024 • 32 Fuel-ups

  Property of richardcfo

• 20.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2019 • 392 Fuel-ups

  Property of iNative

• 15.9 Avg MPG

• Jimmy

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 238 Fuel-ups

  Property of cowpen

• 19.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2023 • 99 Fuel-ups

  Property of Harvey4335

• 14.9 Avg MPG

• GMC Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Oct 2022 • 70 Fuel-ups

  Property of ArtieBar64

• 16.4 Avg MPG

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