Based on data from 265 vehicles, 19,636 fuel-ups and 7,501,485 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.32 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (170) 4.3L V6 GAS (1) 5.3L V8 GAS (53) 6.2L V8 GAS (30) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (69) Cab & Chassis - Crew Cab (3) Any Submodel Base (1) SLE (10) SLT (38) Denali (47) Elevation (63) AT4 (106)

Below you can see a distribution of the fuel-ups with 104 outliers (0.53%) removed.

Following shows the average MPG of each of the 265 vehicles in the system.

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• Denali

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Aug 2021 • 160 Fuel-ups

  Property of wingaterk

• 17.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 24 Fuel-ups

  Property of jacobgoff

• 16.3 Avg MPG

• Sierra 1500 Elavation

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 90 Fuel-ups

  Property of lj1064

• 24.8 Avg MPG

• White Walker

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2023 • 90 Fuel-ups

  Property of imca35

• 21.9 Avg MPG

• Yodha

  2021 GMC Sierra 1500 SLE 2.7L L4 GAS Automatic 8 Speed Extended Cab Pickup
  Added Oct 2021 • 169 Fuel-ups

  Property of YODHA

• 22.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 35 Fuel-ups

  Property of Ffterman

• 18.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2024 • 35 Fuel-ups

  Property of caf2412

• 15.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 139 Fuel-ups

  Property of Nefariouss

• 21.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Dec 2024 • 27 Fuel-ups

  Property of Andrew03

• 15.2 Avg MPG

• Big Red

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2024 • 41 Fuel-ups

  Property of ccolella

• 14.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2023 • 35 Fuel-ups

  Property of aximiliei

• 19.5 Avg MPG

• 2021 GMC Diesel AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2025 • 11 Fuel-ups

  Property of SouthDakotaLove

• 22.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2023 • 67 Fuel-ups

  Property of cbroberts88

• 17.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 291 Fuel-ups

  Property of Silverflash22

• 22.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 170 Fuel-ups

  Property of TnTiger

• 23.0 Avg MPG

• 2021 GMC Sierra

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Crew Cab Pickup
  Added Mar 2024 • 62 Fuel-ups

  Property of Roy2Chin

• 18.3 Avg MPG

• GMC SD

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2023 • 59 Fuel-ups

  Property of burkian

• 25.3 Avg MPG

• GMC

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Extended Cab Pickup
  Added Jan 2022 • 67 Fuel-ups

  Property of johnny91750

• 25.6 Avg MPG

• Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2025 • 5 Fuel-ups

  Property of endorphine44

• 24.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 142 Fuel-ups

  Property of knooski

• 22.7 Avg MPG

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