Based on data from 240 vehicles, 15,296 fuel-ups and 5,828,332 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.31 with a 0.09 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (157) 5.3L V8 GAS (45) 6.2L V8 GAS (27) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (59) Cab & Chassis - Crew Cab (3) Any Submodel SLE (9) SLT (35) Denali (43) Elevation (58) AT4 (95)

Below you can see a distribution of the fuel-ups with 85 outliers (0.55%) removed.

Following shows the average MPG of each of the 240 vehicles in the system.

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• CarbonPro GMC

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Mar 2022 • 87 Fuel-ups

  Property of sefowler

• 24.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 116 Fuel-ups

  Property of rs4mtnitro

• 22.0 Avg MPG

• Caroline

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2023 • 31 Fuel-ups

  Property of Ryharris

• 21.1 Avg MPG

• GMC

  2021 GMC Sierra 1500 SLT
  Added Jan 2023 • 78 Fuel-ups

  Property of builder604

• 16.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 224 Fuel-ups

  Property of ryank880

• 21.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2023 • 30 Fuel-ups

  Property of AndyLarkins

• 26.1 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2022 • 66 Fuel-ups

  Property of milcher

• 21.2 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 10 Speed
  Added Apr 2021 • 111 Fuel-ups

  Property of yogi-bear

• 17.1 Avg MPG

• GMC Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2022 • 50 Fuel-ups

  Property of gtanner

• 27.1 Avg MPG

• '21 GMC

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2022 • 32 Fuel-ups

  Property of tdguenth

• 24.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2023 • 22 Fuel-ups

  Property of Griffis89

• 19.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 189 Fuel-ups

  Property of 3xjlerma

• 18.5 Avg MPG

• AT4 Gray Dragon

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2021 • 156 Fuel-ups

  Property of tank91w

• 15.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2023 • 54 Fuel-ups

  Property of dudecker

• 25.9 Avg MPG

• Night Train

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2021 • 303 Fuel-ups

  Property of jbab2004

• 19.4 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 cbroberts88

• 18.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2022 • 80 Fuel-ups

  Property of BDann

• 22.5 Avg MPG

• Sierra 1500 Elavation

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 49 Fuel-ups

  Property of lj1064

• 26.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2021 • 165 Fuel-ups

  Property of jwarner77

• 24.1 Avg MPG

• Elevation Diesel 2x4

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 112 Fuel-ups

  Property of jcour

• 29.7 Avg MPG

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