2021 GMC Sierra 2500 HD MPG
Based on data from 71 vehicles, 4,585 fuel-ups and 1,478,354 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 (0.41%) removed.
Following shows the average MPG of each of the 71 vehicles in the system.
2021 GMC Sierra 2500 HDs For Sale Nearby
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Dec 2020 • 113 Fuel-upsProperty of mbrent77
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15.7 Avg MPG
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2500Hd GMC
2021 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
Added May 2021 • 154 Fuel-upsProperty of jmgolden1978
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14.0 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 • 253 Fuel-upsProperty of mcgr0401
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13.1 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 • 20 Fuel-upsProperty of WillyM
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12.2 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 • 259 Fuel-upsProperty of Buellx72
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11.3 Avg MPG
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2021
2021 GMC Sierra 2500 HD Denali Crew Cab Pickup
Added Dec 2020 • 206 Fuel-upsProperty of lampmant
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13.0 Avg MPG
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD SLT 6.6L V8 DIESEL Automatic 10 Speed
Added Jul 2024 • 17 Fuel-upsProperty of jbhardman
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13.2 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 • 114 Fuel-upsProperty of bcfiremedic
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11.9 Avg MPG
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GMC
2021 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Jul 2024 • 16 Fuel-upsProperty of JK27
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13.1 Avg MPG
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD SLE 6.6L V8 GAS Automatic 6 Speed
Added Nov 2024 • 21 Fuel-upsProperty of Anticyclone
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11.3 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 • 103 Fuel-upsProperty of DenaliDad
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14.7 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 • 189 Fuel-upsProperty of SeB21
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17.1 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 • 27 Fuel-upsProperty of egobuster1
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14.7 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 • 86 Fuel-upsProperty of scrabble890
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14.3 Avg MPG
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2021 Sierra Denali HD
2021 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Dec 2020 • 213 Fuel-upsProperty of LynnE24
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14.2 Avg MPG
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My Sierra 2500 HD
2021 GMC Sierra 2500 HD Denali 6.6L V8 DIESEL Automatic 6 Speed
Added Jan 2025 • 12 Fuel-upsProperty of keenwyatt
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14.5 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 • 252 Fuel-upsProperty of kbeazley
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10.7 Avg MPG
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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 • 70 Fuel-upsProperty of Bost05
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12.5 Avg MPG
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Sierra 2500 HD aka Sully
2021 GMC Sierra 2500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added May 2021 • 125 Fuel-upsProperty of Ryot
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12.0 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 • 171 Fuel-upsProperty of bdamats
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11.2 Avg MPG