Based on data from 259 vehicles, 19,146 fuel-ups and 7,313,001 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 (165) 4.3L V6 GAS (1) 5.3L V8 GAS (53) 6.2L V8 GAS (29) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (66) Cab & Chassis - Crew Cab (3) Any Submodel Base (1) SLE (10) SLT (38) Denali (44) Elevation (62) AT4 (104)

Below you can see a distribution of the fuel-ups with 100 outliers (0.52%) removed.

Following shows the average MPG of each of the 259 vehicles in the system.

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• ...
• 12
• 13
• »

• GMC Sierra

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jul 2024 • 41 Fuel-ups

  Property of steven289

• 25.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 126 Fuel-ups

  Property of mastrodan3rd

• 17.5 Avg MPG

• GMC

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Extended Cab Pickup
  Added Jan 2022 • 64 Fuel-ups

  Property of johnny91750

• 25.8 Avg MPG

• Sierra 1500 Elavation

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 83 Fuel-ups

  Property of lj1064

• 24.7 Avg MPG

• Mini-Max

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

  Property of chillman1971

• 23.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Aug 2024 • 29 Fuel-ups

  Property of Ffterman

• 18.0 Avg MPG

• Denali

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Aug 2021 • 156 Fuel-ups

  Property of wingaterk

• 17.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 258 Fuel-ups

  Property of Luddy

• 26.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2021 • 170 Fuel-ups

  Property of rs4mtnitro

• 21.3 Avg MPG

• QuilTruck

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jan 2025 • 3 Fuel-ups

  Property of QuilXT

• 25.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 173 Fuel-ups

  Property of flodin30

• 24.0 Avg MPG

• AT4 Gray Dragon

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2021 • 210 Fuel-ups

  Property of tank91w

• 15.6 Avg MPG

• GMC SD

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2023 • 56 Fuel-ups

  Property of burkian

• 25.4 Avg MPG

• AT4

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2023 • 110 Fuel-ups

  Property of rockopolster

• 16.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2020 • 129 Fuel-ups

  Property of travreed22

• 23.2 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 205 Fuel-ups

  Property of MWC_64

• 23.0 Avg MPG

• 2021 GMC Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 209 Fuel-ups

  Property of JasperAutos

• 21.2 Avg MPG

• Sierra

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 101 Fuel-ups

  Property of whippo3

• 23.6 Avg MPG

• My Sierra 1500

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

  Property of CJ_KC

• 25.1 Avg MPG

• White Walker

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2023 • 84 Fuel-ups

  Property of imca35

• 22.0 Avg MPG

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• ...
• 12
• 13
• »