2018 GMC Sierra MPG
Based on data from 3 vehicles, 148 fuel-ups and 48,840 miles of driving, the 2018 GMC Sierra gets a combined Avg MPG of 16.05 with a 0.18 MPG margin of error.
Below you can see a distribution of the fuel-ups with 7 outliers (4.52%) removed.
Following shows the average MPG of each of the 3 vehicles in the system.
2018 GMC Sierras For Sale Nearby
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My Sierra
2018 GMC Sierra Denali 6.2L V8 GAS Automatic 8 Speed
Added Mar 2019 • 177 Fuel-upsProperty of snoopkeith
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17.7 Avg MPG
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My Sierra
2018 GMC Sierra SLE 5.3L V8 FLEX Automatic 6 Speed
Added Oct 2023 • 5 Fuel-upsProperty of AllOut
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7.3 Avg MPG
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Truck
2018 GMC Sierra All Terrain 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
Added Oct 2020 • 4 Fuel-upsProperty of henryjp
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16.0 Avg MPG