Based on data from 195 vehicles, 20,071 fuel-ups and 5,667,168 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 15.92 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 (56) Any Body Style Crew Cab Pickup (53) Extended Cab Pickup (9) Standard Cab Pickup (4) Any Submodel Base (12) SLE (32) Denali (42) SLT (109)

Below you can see a distribution of the fuel-ups with 287 outliers (1.41%) removed.

Following shows the average MPG of each of the 195 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 • 124 Fuel-ups

  Property of BowManGuardian

• 14.5 Avg MPG

• Truck

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2020 • 233 Fuel-ups

  Property of jasonbrakhage

• 14.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2019 • 468 Fuel-ups

  Property of iNative

• 16.1 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2023 • 87 Fuel-ups

  Property of Jhs4

• 14.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Aug 2022 • 92 Fuel-ups

  Property of Miles_To_Go

• 15.8 Avg MPG

• Vador

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Apr 2024 • 101 Fuel-ups

  Property of drink2006

• 17.6 Avg MPG

• Number 9

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 269 Fuel-ups

  Property of woodsmith

• 17.5 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 511 Fuel-ups

  Property of jered6323

• 14.5 Avg MPG

• Jolene

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jul 2020 • 209 Fuel-ups

  Property of eddiemoney

• 16.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2024 • 125 Fuel-ups

  Property of o_dog2003

• 15.0 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 210 Fuel-ups

  Property of bgrinder90

• 14.0 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2024 • 118 Fuel-ups

  Property of Jathroo

• 17.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2018 • 268 Fuel-ups

  Property of rleitht

• 15.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added May 2024 • 155 Fuel-ups

  Property of Zebby76

• 16.0 Avg MPG

• GMC Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Oct 2022 • 89 Fuel-ups

  Property of ArtieBar64

• 16.3 Avg MPG

• Jimmy

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 269 Fuel-ups

  Property of cowpen

• 19.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2021 • 241 Fuel-ups

  Property of riggity27

• 14.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Feb 2019 • 246 Fuel-ups

  Property of turbonix

• 17.4 Avg MPG

• Rooster

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2019 • 185 Fuel-ups

  Property of x62605

• 17.5 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Extended Cab Pickup
  Added May 2018 • 551 Fuel-ups

  Property of joenrox

• 16.7 Avg MPG

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