Based on data from 271 vehicles, 20,250 fuel-ups and 7,740,929 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 (173) 4.3L V6 GAS (1) 5.3L V8 GAS (55) 6.2L V8 GAS (31) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (70) Cab & Chassis - Crew Cab (3) Any Submodel Base (1) SLE (11) SLT (40) Denali (47) Elevation (64) AT4 (108)

Below you can see a distribution of the fuel-ups with 110 outliers (0.54%) removed.

Following shows the average MPG of each of the 271 vehicles in the system.

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• ...
• 13
• 14
• »

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Jan 2024 • 89 Fuel-ups

  Property of KGermany97

• 17.5 Avg MPG

• White Walker

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2023 • 97 Fuel-ups

  Property of imca35

• 21.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 300 Fuel-ups

  Property of ryank880

• 21.5 Avg MPG

• Denali

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 141 Fuel-ups

  Property of stagrlee

• 18.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2021 • 81 Fuel-ups

  Property of jcg2009

• 22.1 Avg MPG

• AT4 MiniMax

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Mar 2025 • 9 Fuel-ups

  Property of glfirefighter144

• 27.6 Avg MPG

• 21 Sierra

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2023 • 92 Fuel-ups

  Property of zlaupp

• 16.5 Avg MPG

• QuilTruck

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2025 • 11 Fuel-ups

  Property of QuilXT

• 26.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 251 Fuel-ups

  Property of AT4-GLI

• 23.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 262 Fuel-ups

  Property of MoeD

• 24.2 Avg MPG

• AT4 Gray Dragon

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2021 • 224 Fuel-ups

  Property of tank91w

• 15.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2023 • 61 Fuel-ups

  Property of MysticMissile4

• 17.0 Avg MPG

• 2021 GMC Sierra

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Crew Cab Pickup
  Added Mar 2024 • 66 Fuel-ups

  Property of Roy2Chin

• 18.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Dec 2024 • 38 Fuel-ups

  Property of Andrew03

• 15.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 184 Fuel-ups

  Property of flodin30

• 23.9 Avg MPG

• GMC Blackout

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2021 • 151 Fuel-ups

  Property of brockon

• 20.2 Avg MPG

• 2021 GMC Diesel AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2025 • 17 Fuel-ups

  Property of SouthDakotaLove

• 22.4 Avg MPG

• Night Train

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2021 • 396 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 Jun 2021 • 148 Fuel-ups

  Property of sooner2016

• 25.2 Avg MPG

• GMC SD

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2023 • 64 Fuel-ups

  Property of burkian

• 25.4 Avg MPG

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• ...
• 13
• 14
• »