Based on data from 263 vehicles, 19,483 fuel-ups and 7,442,109 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 (169) 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 (68) Cab & Chassis - Crew Cab (3) Any Submodel Base (1) SLE (10) SLT (38) Denali (46) Elevation (63) AT4 (105)

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 263 vehicles in the system.

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• Sierra 1500 Duramax

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2022 • 173 Fuel-ups

  Property of jdrockin

• 24.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 243 Fuel-ups

  Property of AT4-GLI

• 23.4 Avg MPG

• 21 Sierra

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2023 • 84 Fuel-ups

  Property of zlaupp

• 16.5 Avg MPG

• Sierra

  2021 GMC Sierra 1500 4.3L V6 GAS Automatic 6 Speed
  Added Dec 2024 • 13 Fuel-ups

  Property of michael2660

• 12.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 174 Fuel-ups

  Property of crs5011

• 24.7 Avg MPG

• My Sierra 1500

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

  Property of MoeD

• 24.1 Avg MPG

• Reba

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Mar 2021 • 202 Fuel-ups

  Property of voodoochild24

• 16.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2025 • 17 Fuel-ups

  Property of HagsSierra

• 25.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 201 Fuel-ups

  Property of Biggs2021

• 25.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 289 Fuel-ups

  Property of ryank880

• 21.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2021 • 68 Fuel-ups

  Property of MLTGMC

• 27.0 Avg MPG

• Lucille

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2023 • 59 Fuel-ups

  Property of kwhight

• 17.9 Avg MPG

• 2021 Elevation

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2021 • 180 Fuel-ups

  Property of craigw76

• 18.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2024 • 31 Fuel-ups

  Property of caf2412

• 15.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 179 Fuel-ups

  Property of rs4mtnitro

• 21.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 33 Fuel-ups

  Property of Ffterman

• 17.9 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2022 • 111 Fuel-ups

  Property of milcher

• 21.2 Avg MPG

• Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2024 • 16 Fuel-ups

  Property of rendrog

• 22.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 132 Fuel-ups

  Property of travreed22

• 23.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2023 • 73 Fuel-ups

  Property of AndyLarkins

• 26.2 Avg MPG

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