Based on data from 186 vehicles, 16,505 fuel-ups and 4,660,203 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.

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• »

• Number 9

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 206 Fuel-ups

  Property of woodsmith

• 17.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Aug 2022 • 52 Fuel-ups

  Property of Miles_To_Go

• 15.9 Avg MPG

• Sierra

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Oct 2018 • 172 Fuel-ups

  Property of ScottyR

• 14.0 Avg MPG

• Rooster

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2019 • 125 Fuel-ups

  Property of x62605

• 17.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2019 • 326 Fuel-ups

  Property of iNative

• 15.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2021 • 155 Fuel-ups

  Property of riggity27

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Feb 2019 • 191 Fuel-ups

  Property of turbonix

• 17.5 Avg MPG

• Glenn

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2020 • 267 Fuel-ups

  Property of ghcrawford

• 14.9 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 425 Fuel-ups

  Property of jered6323

• 14.5 Avg MPG

• 033

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Mar 2024 • 7 Fuel-ups

  Property of jirpol

• 14.2 Avg MPG

• Black Betty

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Dec 2018 • 297 Fuel-ups

  Property of tlawson85

• 18.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Feb 2024 • 13 Fuel-ups

  Property of BowManGuardian

• 16.3 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 • 244 Fuel-ups

  Property of mpg01

• 17.2 Avg MPG

• Truck

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2020 • 177 Fuel-ups

  Property of jasonbrakhage

• 14.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2023 • 16 Fuel-ups

  Property of bsimmons86

• 13.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Mar 2018 • 212 Fuel-ups

  Property of chilly0999

• 16.0 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 8 Speed
  Added Feb 2018 • 397 Fuel-ups

  Property of elliston61

• 20.3 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2023 • 17 Fuel-ups

  Property of Jhs4

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2019 • 17 Fuel-ups

  Property of jessbeavers

• 26.7 Avg MPG

• GMC Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Oct 2022 • 46 Fuel-ups

  Property of ArtieBar64

• 16.5 Avg MPG

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• »