Click here to see important news regarding the aCar App

2018 GMC Sierra MPG

Based on data from 3 vehicles, 147 fuel-ups and 48,501 miles of driving, the 2018 GMC Sierra gets a combined Avg MPG of 16.04 with a 0.18 MPG margin of error.

Below you can see a distribution of the fuel-ups with 7 outliers (4.55%) removed.

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

2018 GMC Sierras For Sale Nearby

  • My Sierra

    2018 GMC Sierra Denali 6.2L V8 GAS Automatic 8 Speed
    Added Mar 2019 • 176 Fuel-ups

    Property of snoopkeith

  • 17.7 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

Recent Activity

from other GMC Sierra vehicles (View All)

Tips

Steptronic transmissions - upshift to highest gear possible

At 35 mph, my automatic transmission is at 5th gear and 1800... ...

by cuts_off_prius

Read more tips