Based on data from 249 vehicles, 17,735 fuel-ups and 6,765,287 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.33 with a 0.09 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (160) 5.3L V8 GAS (50) 6.2L V8 GAS (28) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (62) Cab & Chassis - Crew Cab (3) Any Submodel SLE (10) SLT (37) Denali (42) Elevation (60) AT4 (100)

Below you can see a distribution of the fuel-ups with 92 outliers (0.52%) removed.

Following shows the average MPG of each of the 249 vehicles in the system.

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• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2021 • 321 Fuel-ups

  Property of jtowns

• 17.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2023 • 64 Fuel-ups

  Property of snoogans7031

• 17.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2023 • 57 Fuel-ups

  Property of AndyLarkins

• 26.2 Avg MPG

• 21Elevation-X31

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed Extended Cab Pickup
  Added Dec 2023 • 42 Fuel-ups

  Property of csfx8588

• 18.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2024 • 13 Fuel-ups

  Property of kdillon00

• 22.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 241 Fuel-ups

  Property of 3xjlerma

• 18.4 Avg MPG

• Sierra 1500 Duramax

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2022 • 161 Fuel-ups

  Property of jdrockin

• 24.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 158 Fuel-ups

  Property of flodin30

• 24.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 94 Fuel-ups

  Property of Istijour

• 24.0 Avg MPG

• Night Train

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2021 • 364 Fuel-ups

  Property of jbab2004

• 19.5 Avg MPG

• Lucille

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2023 • 46 Fuel-ups

  Property of kwhight

• 17.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 156 Fuel-ups

  Property of crs5011

• 24.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 47 Fuel-ups

  Property of mnm6080

• 24.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 15 Fuel-ups

  Property of Ffterman

• 18.9 Avg MPG

• GMC Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2024 • 22 Fuel-ups

  Property of zwood131

• 22.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 16 Fuel-ups

  Property of rickwhaas

• 19.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 130 Fuel-ups

  Property of Nefariouss

• 21.1 Avg MPG

• GMC SD

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2023 • 47 Fuel-ups

  Property of burkian

• 25.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 147 Fuel-ups

  Property of TnTiger

• 23.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 271 Fuel-ups

  Property of Silverflash22

• 22.5 Avg MPG

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