2021 GMC Sierra 3500 HD MPG
Based on data from 37 vehicles, 3,230 fuel-ups and 1,094,730 miles of driving, the 2021 GMC Sierra 3500 HD gets a combined Avg MPG of 13.89 with a 0.15 MPG margin of error.
Below you can see a distribution of the fuel-ups with 16 outliers (0.49%) 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 AT4 6.6L V8 DIESEL Automatic 10 Speed
Added Dec 2020 • 173 Fuel-upsProperty of Packert
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13.6 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Jun 2023 • 203 Fuel-upsProperty of jillandduane
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12.4 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 • 274 Fuel-upsProperty of SeanAZ
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14.2 Avg MPG
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Sierra 3500 Dually
2021 GMC Sierra 3500 HD SLT 6.6L V8 DIESEL Automatic 10 Speed
Added Mar 2021 • 79 Fuel-upsProperty of JoshMundy
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12.1 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 • 152 Fuel-upsProperty of wbernards
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12.8 Avg MPG
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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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Georgia
2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added Jan 2024 • 51 Fuel-upsProperty of cniehaus
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15.8 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 • 116 Fuel-upsProperty of hamiltbl2
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16.5 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 • 143 Fuel-upsProperty of jr32313
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14.7 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 • 256 Fuel-upsProperty of cowdoc
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18.6 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Jun 2021 • 129 Fuel-upsProperty of kmf620
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15.7 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 • 20 Fuel-upsProperty of bvermilion
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12.9 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 • 39 Fuel-upsProperty of Flatchevy
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15.9 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 • 150 Fuel-upsProperty of stu1029
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15.5 Avg MPG
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My Sierra 3500 HD
2021 GMC Sierra 3500 HD Denali 6.6L V8 DIESEL Automatic 10 Speed
Added Dec 2020 • 125 Fuel-upsProperty of ivandude44
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14.2 Avg MPG
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Sully
2021 GMC Sierra 3500 HD AT4 6.6L V8 GAS Automatic 6 Speed
Added Sep 2021 • 65 Fuel-upsProperty of kstile
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12.9 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 • 182 Fuel-upsProperty of rdf1982
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12.3 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 • 197 Fuel-upsProperty of jdnewman2021
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11.4 Avg MPG
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AT4
2021 GMC Sierra 3500 HD AT4 6.6L V8 DIESEL Automatic 10 Speed
Added May 2021 • 139 Fuel-upsProperty of jman3794
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10.9 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 • 61 Fuel-upsProperty of ob_1jr77
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12.8 Avg MPG