2021 GMC Sierra 3500 HD MPG
Based on data from 37 vehicles, 3,312 fuel-ups and 1,123,247 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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My Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Dec 2020 • 129 Fuel-upsProperty of ivandude44
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14.1 Avg MPG
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AT4
2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
Added Mar 2021 • 261 Fuel-upsProperty of cowdoc
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18.6 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 • 95 Fuel-upsProperty of rspeters
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13.0 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added Dec 2020 • 179 Fuel-upsProperty of Packert
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13.6 Avg MPG
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2021 GMC AT4 3500
2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Crew Cab Pickup
Added Nov 2020 • 146 Fuel-upsProperty of jr32313
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14.7 Avg MPG
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Thor
2021 GMC Sierra 3500 HD SLE 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
Added Nov 2021 • 200 Fuel-upsProperty of jdnewman2021
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11.6 Avg MPG
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Georgia
2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added Jan 2024 • 55 Fuel-upsProperty of cniehaus
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16.1 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Jun 2023 • 210 Fuel-upsProperty of jillandduane
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12.4 Avg MPG
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2021 GMC Sierra 3500 HD AT4
2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added May 2021 • 160 Fuel-upsProperty of wbernards
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12.6 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Dec 2020 • 284 Fuel-upsProperty of SeanAZ
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14.2 Avg MPG
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2021 GMC Denali 3500HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
Added Mar 2022 • 64 Fuel-upsProperty of ob_1jr77
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12.9 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Jun 2021 • 132 Fuel-upsProperty of kmf620
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15.7 Avg MPG
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2021 Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Feb 2021 • 47 Fuel-upsProperty of Flatchevy
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15.4 Avg MPG
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Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Mar 2021 • 194 Fuel-upsProperty of rdf1982
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12.2 Avg MPG
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Sully
2021 GMC Sierra 3500 HD AT4 6.6L V8 GAS Automatic 6 Speed
Added Sep 2021 • 67 Fuel-upsProperty of kstile
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12.9 Avg MPG
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GMC
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
Added Mar 2024 • 23 Fuel-upsProperty of bvermilion
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12.9 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added Mar 2022 • 118 Fuel-upsProperty of hamiltbl2
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16.5 Avg MPG
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Denali 3500
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Dec 2020 • 170 Fuel-upsProperty of caddydaddy7
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14.7 Avg MPG
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Adrian
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed Crew Cab Pickup
Added Aug 2022 • 152 Fuel-upsProperty of stu1029
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15.5 Avg MPG
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AT4
2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added May 2021 • 140 Fuel-upsProperty of jman3794
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11.0 Avg MPG