2018 GMC Sierra 1500 MPG
Based on data from 194 vehicles, 19,130 fuel-ups and 5,404,535 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 15.94 with a 0.05 MPG margin of error.
Below you can see a distribution of the fuel-ups with 272 outliers (1.40%) removed.
Following shows the average MPG of each of the 194 vehicles in the system.
2018 GMC Sierra 1500s For Sale Nearby
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My Sierra 1500
2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
Added Jun 2025 • 10 Fuel-upsProperty of bkiefat918
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13.6 Avg MPG
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My Sierra 1500
2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
Added Oct 2019 • 423 Fuel-upsProperty of iNative
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16.1 Avg MPG
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Big Red Eskimo
2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
Added Nov 2021 • 320 Fuel-upsProperty of rkfdwc1
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15.6 Avg MPG
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Denali
2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
Added Jun 2024 • 74 Fuel-upsProperty of Jathroo
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17.1 Avg MPG
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2018 GMC Sierra Denali 4x4
2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
Added Jun 2018 • 294 Fuel-upsProperty of mpg01
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17.1 Avg MPG
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Vador
2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
Added Apr 2024 • 84 Fuel-upsProperty of drink2006
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18.2 Avg MPG
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Jimmy
2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
Added Jan 2018 • 249 Fuel-upsProperty of cowpen
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19.0 Avg MPG
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GMC Denali
2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
Added Oct 2022 • 76 Fuel-upsProperty of ArtieBar64
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16.4 Avg MPG
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Truck
2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
Added May 2018 • 193 Fuel-upsProperty of DrAwesome
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16.3 Avg MPG
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My Sierra 1500
2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
Added Jan 2024 • 143 Fuel-upsProperty of Mr-GreenToCleanPools
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17.5 Avg MPG
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My Sierra 1500
2018 GMC Sierra 1500 Denali 5.3L V8 FLEX Automatic 8 Speed
Added Aug 2023 • 26 Fuel-upsProperty of MaxBurn
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12.6 Avg MPG
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My Sierra 1500
2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
Added Mar 2018 • 275 Fuel-upsProperty of chilly0999
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16.7 Avg MPG
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My Sierra 1500
2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
Added May 2024 • 129 Fuel-upsProperty of Zebby76
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16.4 Avg MPG
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Sierra
2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
Added Jun 2018 • 143 Fuel-upsProperty of JDubz313
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15.5 Avg MPG
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2018 GMC Sierra
2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
Added Apr 2022 • 185 Fuel-upsProperty of rtsteen
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17.7 Avg MPG
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My Sierra 1500
2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
Added Dec 2021 • 216 Fuel-upsProperty of riggity27
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14.8 Avg MPG
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My Sierra 1500
2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
Added Feb 2024 • 89 Fuel-upsProperty of BowManGuardian
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14.9 Avg MPG
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Sierra
2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
Added Apr 2019 • 483 Fuel-upsProperty of CAHayes1109
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14.0 Avg MPG
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GMC Sierra 1500
2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
Added Jun 2018 • 412 Fuel-upsProperty of Buckshot48
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17.9 Avg MPG
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Denali
2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
Added Jan 2018 • 402 Fuel-upsProperty of Godofwine7
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15.9 Avg MPG