Based on data from 249 vehicles, 17,750 fuel-ups and 6,770,554 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.33 with a 0.08 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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• Sierra SLT

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Aug 2021 • 34 Fuel-ups

  Property of Toolmandbq

• 14.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2021 • 50 Fuel-ups

  Property of fuzz26

• 19.9 Avg MPG

• Rudy

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 60 Fuel-ups

  Property of jacyna

• 18.4 Avg MPG

• GMC A19636 01 2023

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 10 Speed
  Added Jan 2023 • 24 Fuel-ups

  Property of Robbo1968

• 16.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Sep 2021 • 207 Fuel-ups

  Property of jblomseth

• 17.1 Avg MPG

• 2021 AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2023 • 29 Fuel-ups

  Property of elowx

• 22.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2022 • 22 Fuel-ups

  Property of Rackumrack

• 15.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 7 Fuel-ups

  Property of jayp61

• 26.1 Avg MPG

• 2021 GMC

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2021 • 36 Fuel-ups

  Property of creso

• 19.2 Avg MPG

• 2021 GMC Sierra 1500 AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 96 Fuel-ups

  Property of rotorslap

• 20.7 Avg MPG

• GMC Sierra 1500 Duramax

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jul 2021 • 54 Fuel-ups

  Property of jshodges-tx

• 21.2 Avg MPG

• GMC

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Dec 2021 • 99 Fuel-ups

  Property of msgraves33

• 19.4 Avg MPG

• 2021 White Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 10 Speed
  Added Dec 2022 • 9 Fuel-ups

  Property of Robbo1968

• 16.8 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added May 2021 • 53 Fuel-ups

  Property of Mikecompton

• 15.7 Avg MPG

• Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added May 2022 • 34 Fuel-ups

  Property of SeanLewis10

• 15.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2022 • 20 Fuel-ups

  Property of Camstyn

• 27.4 Avg MPG

• 2021 GMC Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Feb 2022 • 27 Fuel-ups

  Property of abose

• 26.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 48 Fuel-ups

  Property of scubaking69

• 22.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Nov 2021 • 21 Fuel-ups

  Property of pgsports

• 13.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2022 • 29 Fuel-ups

  Property of jmdunleavy

• 16.2 Avg MPG

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