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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• Elevation Diesel 2x4

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 134 Fuel-ups

  Property of jcour

• 29.6 Avg MPG

• Sierra

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2023 • 42 Fuel-ups

  Property of alex10haken

• 21.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2023 • 44 Fuel-ups

  Property of Griffis89

• 20.6 Avg MPG

• CarbonPro GMC

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Mar 2022 • 104 Fuel-ups

  Property of sefowler

• 24.6 Avg MPG

• White Walker

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2023 • 72 Fuel-ups

  Property of imca35

• 22.2 Avg MPG

• Elevation

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2022 • 57 Fuel-ups

  Property of hollywood703

• 23.1 Avg MPG

• My Sierra 1500

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

  Property of rs4mtnitro

• 22.2 Avg MPG

• 2021 GMC Sierra

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Crew Cab Pickup
  Added Mar 2024 • 44 Fuel-ups

  Property of Roy2Chin

• 18.9 Avg MPG

• Brown D

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 114 Fuel-ups

  Property of sc402443

• 24.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLE 2.7L L4 GAS Automatic 8 Speed
  Added Jun 2022 • 121 Fuel-ups

  Property of jctoss32986

• 14.0 Avg MPG

• Lil White

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2024 • 31 Fuel-ups

  Property of zogeil

• 20.0 Avg MPG

• My Sierra 1500 AT4

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 147 Fuel-ups

  Property of sfwalters

• 18.8 Avg MPG

• GMC

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Extended Cab Pickup
  Added Jan 2022 • 60 Fuel-ups

  Property of johnny91750

• 25.9 Avg MPG

• Sierra

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 64 Fuel-ups

  Property of Adam2kSS

• 22.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2024 • 13 Fuel-ups

  Property of dillpill88

• 16.6 Avg MPG

• Yodha

  2021 GMC Sierra 1500 SLE 2.7L L4 GAS Automatic 8 Speed Extended Cab Pickup
  Added Oct 2021 • 158 Fuel-ups

  Property of YODHA

• 22.5 Avg MPG

• 2021 GMC Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jun 2021 • 88 Fuel-ups

  Property of mdsavoy

• 17.7 Avg MPG

• Family Hauler

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 79 Fuel-ups

  Property of 2013RAM2500

• 23.6 Avg MPG

• Reba

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Mar 2021 • 182 Fuel-ups

  Property of voodoochild24

• 16.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 125 Fuel-ups

  Property of sooner2016

• 25.2 Avg MPG

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