Based on data from 255 vehicles, 18,407 fuel-ups and 7,037,947 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.36 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (162) 4.3L V6 GAS (1) 5.3L V8 GAS (53) 6.2L V8 GAS (28) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (63) Cab & Chassis - Crew Cab (3) Any Submodel Base (1) SLE (10) SLT (38) Denali (42) Elevation (61) AT4 (103)

Below you can see a distribution of the fuel-ups with 94 outliers (0.51%) removed.

Following shows the average MPG of each of the 255 vehicles in the system.

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• Sierra 1500 Elavation

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 77 Fuel-ups

  Property of lj1064

• 25.1 Avg MPG

• Whipp'd

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 104 Fuel-ups

  Property of DCsells

• 14.4 Avg MPG

• Night Train

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2021 • 371 Fuel-ups

  Property of jbab2004

• 19.4 Avg MPG

• 2021 GMC

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2021 • 245 Fuel-ups

  Property of ahartman

• 16.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 154 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 Jul 2021 • 232 Fuel-ups

  Property of AT4-GLI

• 23.4 Avg MPG

• Lucille

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2023 • 51 Fuel-ups

  Property of kwhight

• 17.9 Avg MPG

• GMC Sierra

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jul 2024 • 29 Fuel-ups

  Property of steven289

• 26.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2021 • 330 Fuel-ups

  Property of jtowns

• 17.0 Avg MPG

• GMC Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2024 • 27 Fuel-ups

  Property of zwood131

• 22.9 Avg MPG

• Mini-Max

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2024 • 3 Fuel-ups

  Property of chillman1971

• 22.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2023 • 63 Fuel-ups

  Property of cbroberts88

• 18.0 Avg MPG

• 2021 GMC Sierra

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Crew Cab Pickup
  Added Mar 2024 • 50 Fuel-ups

  Property of Roy2Chin

• 18.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 191 Fuel-ups

  Property of yesubyllib

• 23.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2024 • 69 Fuel-ups

  Property of BigBoostDSM

• 15.2 Avg MPG

• My Sierra 1500

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

  Property of sooner2016

• 25.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Jul 2024 • 268 Fuel-ups

  Property of Rockn

• 16.0 Avg MPG

• Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 138 Fuel-ups

  Property of stagrlee

• 18.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 247 Fuel-ups

  Property of Luddy

• 26.6 Avg MPG

• My Sierra 1500 AT4

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 153 Fuel-ups

  Property of sfwalters

• 18.8 Avg MPG

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