2018 GMC Sierra MPG

Based on data from 3 vehicles, 136 fuel-ups and 45,487 miles of driving, the 2018 GMC Sierra gets a combined Avg MPG of 16.24 with a 0.18 MPG margin of error.

Below you can see a distribution of the fuel-ups with 7 outliers (4.90%) removed.

Following shows the average MPG of each of the 3 vehicles in the system.

• My Sierra

  2018 GMC Sierra Denali 6.2L V8 GAS Automatic 8 Speed
  Added Mar 2019 • 160 Fuel-ups

  Property of snoopkeith

• 17.8 Avg MPG

• My Sierra

  2018 GMC Sierra SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2023 • 5 Fuel-ups

  Property of AllOut

• 7.3 Avg MPG

• Truck

  2018 GMC Sierra All Terrain 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Oct 2020 • 4 Fuel-ups

  Property of henryjp

• 16.0 Avg MPG