Based on data from 249 vehicles, 17,735 fuel-ups and 6,765,287 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.33 with a 0.09 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (160) 5.3L V8 GAS (50) 6.2L V8 GAS (28) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (62) Cab & Chassis - Crew Cab (3) Any Submodel SLE (10) SLT (37) Denali (42) Elevation (60) AT4 (100)

Below you can see a distribution of the fuel-ups with 92 outliers (0.52%) removed.

Following shows the average MPG of each of the 249 vehicles in the system.

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• Heather’s Elevation

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Nov 2021 • 17 Fuel-ups

  Property of skelman

• 17.6 Avg MPG

• Sierra

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2022 • 5 Fuel-ups

  Property of fletchyfour

• 16.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 4 Fuel-ups

  Property of GreaseLips

• 20.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2022 • 4 Fuel-ups

  Property of rab986

• 20.1 Avg MPG

• Sierra DMax

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added May 2021 • 13 Fuel-ups

  Property of Fagro

• 26.0 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 21 Fuel-ups

  Property of JG_KR

• 25.2 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 45 Fuel-ups

  Property of standfas

• 20.8 Avg MPG

• MEK AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2021 • 5 Fuel-ups

  Property of mkillingsworth

• 21.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2021 • 35 Fuel-ups

  Property of Ind_ff_emt

• 19.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2021 • 69 Fuel-ups

  Property of Danm1228

• 15.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2021 • 7 Fuel-ups

  Property of dshipman

• 20.8 Avg MPG

• Elevation

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed Cab & Chassis - Crew Cab
  Added Jun 2021 • 18 Fuel-ups

  Property of Kylie1

• 15.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Sep 2021 • 18 Fuel-ups

  Property of Geoff90

• 17.0 Avg MPG

• My Sierra 1500

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

  Property of chrisholly

• 22.1 Avg MPG

• Sierra 21 AT4 3.0

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2021 • 33 Fuel-ups

  Property of billneu08

• 22.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 6 Fuel-ups

  Property of QueueFue

• 23.9 Avg MPG

• Lemonade

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 12 Fuel-ups

  Property of mallman

• 20.6 Avg MPG

• Shadow

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Aug 2021 • 34 Fuel-ups

  Property of Coolaidman

• 17.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2021 • 12 Fuel-ups

  Property of tcochran

• 17.2 Avg MPG

• My Sierra 1500

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

  Property of buehlein

• 26.4 Avg MPG

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