2021 GMC Sierra 2500 HD MPG
Based on data from 74 vehicles, 4,825 fuel-ups and 1,559,633 miles of driving, the 2021 GMC Sierra 2500 HD gets a combined Avg MPG of 13.18 with a 0.11 MPG margin of error.
Below you can see a distribution of the fuel-ups with 19 outliers (0.39%) removed.
Following shows the average MPG of each of the 74 vehicles in the system.
2021 GMC Sierra 2500 HDs For Sale Nearby
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2021 Sierra 2500HD
2021 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
Added Jan 2024 • 78 Fuel-upsProperty of Bost05
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12.6 Avg MPG
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GMC
2021 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Jul 2024 • 26 Fuel-upsProperty of JK27
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12.7 Avg MPG
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AT4
2021 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
Added Oct 2022 • 91 Fuel-upsProperty of scrabble890
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14.3 Avg MPG
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AT4 Whore
2021 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added Mar 2021 • 176 Fuel-upsProperty of pigpen23
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12.4 Avg MPG
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GMC Sierra 2500 HD
2021 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Apr 2023 • 45 Fuel-upsProperty of Jdcompman
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15.9 Avg MPG
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD SLE 6.6L V8 GAS Automatic 10 Speed
Added Oct 2021 • 182 Fuel-upsProperty of bdamats
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11.1 Avg MPG
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD SLE 6.6L V8 DIESEL Automatic 6 Speed
Added Apr 2023 • 273 Fuel-upsProperty of mcgr0401
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13.1 Avg MPG
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD AT4 6.6L V8 GAS Automatic 6 Speed
Added May 2021 • 272 Fuel-upsProperty of Buellx72
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11.3 Avg MPG
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD 6.6L V8 DIESEL Automatic 10 Speed
Added Apr 2025 • 21 Fuel-upsProperty of subie-doo
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12.9 Avg MPG
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD SLT 6.6L V8 GAS Automatic 6 Speed
Added Jan 2021 • 42 Fuel-upsProperty of NGreen08
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10.3 Avg MPG
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Dads Sierra 2500 HD
2021 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 10 Speed
Added Jan 2025 • 34 Fuel-upsProperty of WillyM
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12.7 Avg MPG
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added Sep 2023 • 200 Fuel-upsProperty of SeB21
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17.1 Avg MPG
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2021 Denali HD
2021 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Nov 2020 • 109 Fuel-upsProperty of DenaliDad
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14.8 Avg MPG
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Jul 2024 • 39 Fuel-upsProperty of josterhout1
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15.6 Avg MPG
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Apr 2023 • 129 Fuel-upsProperty of bcfiremedic
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11.9 Avg MPG
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added Jun 2021 • 159 Fuel-upsProperty of xETERNALx
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13.6 Avg MPG
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2021
2021 GMC Sierra 2500 HD Denali Crew Cab Pickup
Added Dec 2020 • 212 Fuel-upsProperty of lampmant
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13.0 Avg MPG
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Truck
2021 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added Nov 2024 • 19 Fuel-upsProperty of MontanaRaptor
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15.5 Avg MPG
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BigTruck
2021 GMC Sierra 2500 HD 6.6L V8 GAS Automatic 6 Speed Crew Cab Pickup
Added Mar 2023 • 68 Fuel-upsProperty of pmhanson
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13.1 Avg MPG
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Jun 2023 • 30 Fuel-upsProperty of egobuster1
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14.6 Avg MPG