Based on data from 256 vehicles, 18,704 fuel-ups and 7,145,883 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.34 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (163) 4.3L V6 GAS (1) 5.3L V8 GAS (53) 6.2L V8 GAS (28) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (63) Cab & Chassis - Crew Cab (3) Any Submodel Base (1) SLE (10) SLT (38) Denali (42) Elevation (62) AT4 (103)

Below you can see a distribution of the fuel-ups with 96 outliers (0.51%) removed.

Following shows the average MPG of each of the 256 vehicles in the system.

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• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Jan 2024 • 52 Fuel-ups

  Property of KGermany97

• 17.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 271 Fuel-ups

  Property of ryank880

• 21.5 Avg MPG

• Sierra

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

  Property of michael2660

• 13.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2023 • 48 Fuel-ups

  Property of Griffis89

• 20.4 Avg MPG

• 2021 GMC Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 206 Fuel-ups

  Property of JasperAutos

• 21.2 Avg MPG

• Sierra

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 68 Fuel-ups

  Property of Adam2kSS

• 22.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 166 Fuel-ups

  Property of flodin30

• 24.0 Avg MPG

• GMC SD

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2023 • 52 Fuel-ups

  Property of burkian

• 25.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2024 • 17 Fuel-ups

  Property of caf2412

• 15.5 Avg MPG

• Family Hauler

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 89 Fuel-ups

  Property of 2013RAM2500

• 23.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 234 Fuel-ups

  Property of AT4-GLI

• 23.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 156 Fuel-ups

  Property of rs4mtnitro

• 22.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2023 • 63 Fuel-ups

  Property of AndyLarkins

• 26.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLE 2.7L L4 GAS Automatic 8 Speed
  Added Jun 2022 • 129 Fuel-ups

  Property of jctoss32986

• 14.0 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 202 Fuel-ups

  Property of MWC_64

• 23.0 Avg MPG

• GMC Sierra

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jul 2024 • 34 Fuel-ups

  Property of steven289

• 25.9 Avg MPG

• Lucille

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2023 • 53 Fuel-ups

  Property of kwhight

• 17.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 71 Fuel-ups

  Property of Erikm1982

• 21.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 26 Fuel-ups

  Property of rickwhaas

• 19.0 Avg MPG

• Elevation Diesel 2x4

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 140 Fuel-ups

  Property of jcour

• 29.5 Avg MPG

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