Based on data from 240 vehicles, 15,320 fuel-ups and 5,836,989 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.

• «
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• »

• Brown D

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 93 Fuel-ups

  Property of sc402443

• 24.2 Avg MPG

• My Sierra 1500

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

  Property of HOMEslice93

• 22.7 Avg MPG

• 2022 AT4 3.0L

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Dec 2021 • 95 Fuel-ups

  Property of Drew6424

• 20.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 127 Fuel-ups

  Property of tmac30075

• 16.4 Avg MPG

• 2021 GMC Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jun 2021 • 70 Fuel-ups

  Property of mdsavoy

• 17.6 Avg MPG

• Denali

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Apr 2022 • 98 Fuel-ups

  Property of DrYooper

• 23.5 Avg MPG

• Big White Truck

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Dec 2020 • 51 Fuel-ups

  Property of eckseleven

• 19.6 Avg MPG

• GMC Blackout

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2021 • 115 Fuel-ups

  Property of brockon

• 20.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jun 2021 • 109 Fuel-ups

  Property of sooner2016

• 25.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2022 • 92 Fuel-ups

  Property of combatrafter

• 22.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2023 • 7 Fuel-ups

  Property of aximiliei

• 20.4 Avg MPG

• 2021 AT4

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

  Property of rvckstar

• 22.5 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2023 • 19 Fuel-ups

  Property of sharkyp14

• 15.4 Avg MPG

• 21 Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 77 Fuel-ups

  Property of Corelax

• 22.2 Avg MPG

• Elevation

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2022 • 43 Fuel-ups

  Property of hollywood703

• 23.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Nov 2021 • 55 Fuel-ups

  Property of steamroller69633

• 15.5 Avg MPG

• Whipp'd

  2021 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Jun 2021 • 93 Fuel-ups

  Property of DCsells

• 14.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 64 Fuel-ups

  Property of CJ_KC

• 25.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2023 • 5 Fuel-ups

  Property of febp85

• 23.0 Avg MPG

• 21 GMC Sierra AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 8 Speed
  Added Oct 2021 • 73 Fuel-ups

  Property of bhess19

• 22.2 Avg MPG

• «
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• »