Based on data from 250 vehicles, 17,774 fuel-ups and 6,779,535 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 (51) 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 (100)

Below you can see a distribution of the fuel-ups with 92 outliers (0.51%) removed.

Following shows the average MPG of each of the 250 vehicles in the system.

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• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 185 Fuel-ups

  Property of Biggs2021

• 26.1 Avg MPG

• 21Elevation-X31

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed Extended Cab Pickup
  Added Dec 2023 • 42 Fuel-ups

  Property of csfx8588

• 18.6 Avg MPG

• Sierra 1500 Duramax

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2022 • 161 Fuel-ups

  Property of jdrockin

• 24.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 158 Fuel-ups

  Property of flodin30

• 24.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 94 Fuel-ups

  Property of Istijour

• 24.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 156 Fuel-ups

  Property of crs5011

• 24.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 47 Fuel-ups

  Property of mnm6080

• 24.7 Avg MPG

• GMC Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Nov 2024 • 22 Fuel-ups

  Property of zwood131

• 22.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 130 Fuel-ups

  Property of Nefariouss

• 21.1 Avg MPG

• GMC SD

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2023 • 47 Fuel-ups

  Property of burkian

• 25.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 147 Fuel-ups

  Property of TnTiger

• 23.0 Avg MPG

• AT4

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2023 • 90 Fuel-ups

  Property of rockopolster

• 17.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 116 Fuel-ups

  Property of wholyon

• 18.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 131 Fuel-ups

  Property of bh1703

• 20.4 Avg MPG

• Clay 2021 Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Feb 2021 • 106 Fuel-ups

  Property of chriii

• 13.7 Avg MPG

• Her Sierra 1500 Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 80 Fuel-ups

  Property of davisfarm86

• 21.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 240 Fuel-ups

  Property of Luddy

• 26.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2024 • 63 Fuel-ups

  Property of BigBoostDSM

• 15.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 222 Fuel-ups

  Property of MoeD

• 24.1 Avg MPG

• Dirtymax

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 109 Fuel-ups

  Property of Jackpot01

• 24.6 Avg MPG

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