Based on data from 258 vehicles, 19,028 fuel-ups and 7,266,398 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 (164) 4.3L V6 GAS (1) 5.3L V8 GAS (53) 6.2L V8 GAS (29) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (65) Cab & Chassis - Crew Cab (3) Any Submodel Base (1) SLE (10) SLT (38) Denali (43) Elevation (62) AT4 (104)

Below you can see a distribution of the fuel-ups with 99 outliers (0.52%) removed.

Following shows the average MPG of each of the 258 vehicles in the system.

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• My Sierra 1500

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 30 Fuel-ups

  Property of rickwhaas

• 18.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2024 • 26 Fuel-ups

  Property of kdillon00

• 22.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 164 Fuel-ups

  Property of TnTiger

• 22.9 Avg MPG

• 2021 GMC

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2021 • 261 Fuel-ups

  Property of ahartman

• 16.6 Avg MPG

• Sierra 1500 Elavation

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 82 Fuel-ups

  Property of lj1064

• 24.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2023 • 50 Fuel-ups

  Property of Griffis89

• 20.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 288 Fuel-ups

  Property of Silverflash22

• 22.4 Avg MPG

• GMC Sierra

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jul 2024 • 40 Fuel-ups

  Property of steven289

• 25.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 281 Fuel-ups

  Property of ryank880

• 21.5 Avg MPG

• My Sierra 1500

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

  Property of sharkyp14

• 16.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 242 Fuel-ups

  Property of MoeD

• 24.1 Avg MPG

• GMC Elevation

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 165 Fuel-ups

  Property of Murph713

• 14.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 124 Fuel-ups

  Property of mastrodan3rd

• 17.5 Avg MPG

• Work Truck

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Jan 2025 • 8 Fuel-ups

  Property of Welchb85

• 14.1 Avg MPG

• AT4

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2023 • 108 Fuel-ups

  Property of rockopolster

• 16.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2024 • 23 Fuel-ups

  Property of caf2412

• 15.6 Avg MPG

• Elevation Diesel 2x4

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 144 Fuel-ups

  Property of jcour

• 29.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 198 Fuel-ups

  Property of yesubyllib

• 23.2 Avg MPG

• Whipp'd

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 107 Fuel-ups

  Property of DCsells

• 14.6 Avg MPG

• Elevation

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2022 • 60 Fuel-ups

  Property of hollywood703

• 22.8 Avg MPG

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