Based on data from 22 vehicles, 1,547 fuel-ups and 512,930 miles of driving, the 2021 GMC Yukon XL gets a combined Avg MPG of 15.56 with a 0.14 MPG margin of error.

Any Engine Type 3.0L L6 DIESEL (6) 5.3L V8 GAS (8) 6.2L V8 GAS (8) Any Body Style Sport Utility (6) Any Submodel AT4 (3) SLT (7) Denali (12)

Below you can see a distribution of the fuel-ups with 92 outliers (5.61%) removed.

Following shows the average MPG of each of the 22 vehicles in the system.

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• My Yukon XL

  2021 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2022 • 165 Fuel-ups

  Property of Hetelle

• 16.4 Avg MPG

• My Yukon XL

  2021 GMC Yukon XL Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Mar 2025 • 9 Fuel-ups

  Property of Forny

• 25.2 Avg MPG

• My Yukon XL

  2021 GMC Yukon XL SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2023 • 63 Fuel-ups

  Property of nmorrell1922

• 22.2 Avg MPG

• My Yukon XL

  2021 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2021 • 118 Fuel-ups

  Property of gottwaldtd

• 14.8 Avg MPG

• Beast

  2021 GMC Yukon XL AT4 5.3L V8 GAS Automatic 10 Speed
  Added Jan 2025 • 25 Fuel-ups

  Property of superJD

• 16.2 Avg MPG

• My Yukon XL

  2021 GMC Yukon XL Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2025 • 13 Fuel-ups

  Property of ydavid98

• 19.6 Avg MPG

• My Yukon XL

  2021 GMC Yukon XL AT4 5.3L V8 GAS Automatic 10 Speed
  Added Apr 2021 • 263 Fuel-ups

  Property of tystebbins

• 15.6 Avg MPG

• My Yukon XL

  2021 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2023 • 117 Fuel-ups

  Property of bqpinc

• 15.4 Avg MPG

• Inverse Hearse

  2021 GMC Yukon XL SLT 5.3L V8 GAS Automatic 10 Speed Sport Utility
  Added Oct 2021 • 164 Fuel-ups

  Property of Jonesjetta

• 16.6 Avg MPG

• 2021 GMC Yukon XL SLT

  2021 GMC Yukon XL SLT 5.3L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 48 Fuel-ups

  Property of Churchillg

• 15.8 Avg MPG

• Yukon XL

  2021 GMC Yukon XL AT4 5.3L V8 GAS Automatic 10 Speed Sport Utility
  Added Aug 2022 • 205 Fuel-ups

  Property of stu1029

• 16.9 Avg MPG

• Yukon XL SLT

  2021 GMC Yukon XL SLT 5.3L V8 GAS Automatic 10 Speed
  Added Dec 2024 • 4 Fuel-ups

  Property of ande0906

• 4.7 Avg MPG

• 2021 Yukon XL Denali

  2021 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed Sport Utility
  Added Jul 2024 • 22 Fuel-ups

  Property of beasticles

• 15.4 Avg MPG

• My Yukon XL 3.0 Duramax

  2021 GMC Yukon XL SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2022 • 34 Fuel-ups

  Property of teamremedy

• 20.6 Avg MPG

• My Yukon XL

  2021 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed
  Added Dec 2023 • 48 Fuel-ups

  Property of jimbowned

• 15.0 Avg MPG

• 2021 Yukon XL

  2021 GMC Yukon XL Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Apr 2021 • 64 Fuel-ups

  Property of triplebts

• 15.4 Avg MPG

• Alicia's Yukon XL

  2021 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed Sport Utility
  Added Aug 2021 • 143 Fuel-ups

  Property of rademarco03

• 15.7 Avg MPG

• Yuki

  2021 GMC Yukon XL SLT 5.3L V8 GAS Automatic 10 Speed Sport Utility
  Added Jul 2021 • 88 Fuel-ups

  Property of bugsbunny01

• 12.4 Avg MPG

• My Yukon XL

  2021 GMC Yukon XL SLT 5.3L V8 GAS Automatic 10 Speed
  Added Jun 2021 • 111 Fuel-ups

  Property of Pebsk1225

• 14.9 Avg MPG

• My Yukon XL

  2021 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 90 Fuel-ups

  Property of prezme

• 16.8 Avg MPG

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