2021 GMC Sierra 3500 HD MPG
Based on data from 37 vehicles, 3,302 fuel-ups and 1,119,651 miles of driving, the 2021 GMC Sierra 3500 HD gets a combined Avg MPG of 13.88 with a 0.15 MPG margin of error.
Below you can see a distribution of the fuel-ups with 17 outliers (0.51%) removed.
Following shows the average MPG of each of the 37 vehicles in the system.
2021 GMC Sierra 3500 HDs For Sale Nearby
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Duramax
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added May 2021 • 59 Fuel-upsProperty of schroeder26
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12.5 Avg MPG
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Sierra 3500 HD
2021 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 10 Speed
Added May 2021 • 44 Fuel-upsProperty of loricap
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15.0 Avg MPG
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AT4
2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
Added Jun 2021 • 95 Fuel-upsProperty of crossmanj21
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14.8 Avg MPG
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GMC Diesel
2021 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
Added Apr 2021 • 94 Fuel-upsProperty of rspeters
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13.0 Avg MPG
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2021 GMC Sierra 3500 HD Denali
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
Added Mar 2022 • 109 Fuel-upsProperty of windycitypilot
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16.0 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Jul 2021 • 57 Fuel-upsProperty of rzrscubasteve03
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13.4 Avg MPG
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Odin
2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added Mar 2022 • 31 Fuel-upsProperty of en3chix
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11.2 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added Apr 2021 • 36 Fuel-upsProperty of JBAero
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11.1 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Nov 2024 • 19 Fuel-upsProperty of kdreverman
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13.9 Avg MPG
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Frosty
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Jul 2021 • 8 Fuel-upsProperty of iammrniceguy
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9.3 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD SLT 6.6L V8 GAS Automatic 6 Speed
Added Jun 2021 • 58 Fuel-upsProperty of gmc3500
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13.0 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Apr 2021 • 66 Fuel-upsProperty of michael1538
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10.7 Avg MPG
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2021 GMC Sierra 3500 HD Denali
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
Added Jan 2021 • 34 Fuel-upsProperty of windycitypilot
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14.5 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Sep 2021 • 13 Fuel-upsProperty of jjchambs
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13.4 Avg MPG
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Bob's Denali
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
Added Jun 2022 • 27 Fuel-upsProperty of Pierce56
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10.6 Avg MPG
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2021 Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added May 2021 • 21 Fuel-upsProperty of joshuaw
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11.5 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Apr 2021 • 26 Fuel-upsProperty of Benilac20
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13.0 Avg MPG
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