Based on data from 253 vehicles, 18,315 fuel-ups and 7,003,706 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.37 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (161) 5.3L V8 GAS (53) 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 (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 253 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 • 327 Fuel-ups

  Property of jtowns

• 17.0 Avg MPG

• 2021 Elevation

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2021 • 165 Fuel-ups

  Property of craigw76

• 18.5 Avg MPG

• 2021 GMC Sierra SLT 1500 4WD

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2023 • 34 Fuel-ups

  Property of blrains706

• 23.9 Avg MPG

• GMC Sierra 1500 Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 157 Fuel-ups

  Property of Slugster

• 23.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2023 • 59 Fuel-ups

  Property of cbroberts88

• 18.0 Avg MPG

• Family Hauler

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 84 Fuel-ups

  Property of 2013RAM2500

• 23.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 152 Fuel-ups

  Property of TnTiger

• 23.0 Avg MPG

• Grey Ghost

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2021 • 141 Fuel-ups

  Property of Britbeamer

• 19.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2023 • 61 Fuel-ups

  Property of AndyLarkins

• 26.2 Avg MPG

• AT4 Gray Dragon

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2021 • 197 Fuel-ups

  Property of tank91w

• 15.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 150 Fuel-ups

  Property of rs4mtnitro

• 22.1 Avg MPG

• GMC Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2024 • 26 Fuel-ups

  Property of zwood131

• 22.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 84 Fuel-ups

  Property of crowan43

• 21.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Aug 2021 • 118 Fuel-ups

  Property of johnoutdoors

• 21.7 Avg MPG

• Elevation Diesel 2x4

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 137 Fuel-ups

  Property of jcour

• 29.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Jul 2024 • 266 Fuel-ups

  Property of Rockn

• 16.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 188 Fuel-ups

  Property of Biggs2021

• 26.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 278 Fuel-ups

  Property of Silverflash22

• 22.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 161 Fuel-ups

  Property of crs5011

• 24.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 118 Fuel-ups

  Property of wholyon

• 18.0 Avg MPG

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