Based on data from 17 vehicles, 1,110 fuel-ups and 403,810 miles of driving, the 2018 GMC Yukon XL gets a combined Avg MPG of 15.53 with a 0.17 MPG margin of error.

Any Engine Type 5.3L V8 FLEX (1) 5.3L V8 GAS (1) 6.2L V8 FLEX (8) 6.2L V8 GAS (7) Any Body Style Sport Utility (5) Any Submodel SLT (2) Denali (15)

Below you can see a distribution of the fuel-ups with 60 outliers (5.13%) removed.

Following shows the average MPG of each of the 17 vehicles in the system.

• Yukon XL

  2018 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 138 Fuel-ups

  Property of beckertm

• 14.6 Avg MPG

• My Yukon XL

  2018 GMC Yukon XL Denali 6.2L V8 FLEX Automatic 10 Speed
  Added Feb 2023 • 50 Fuel-ups

  Property of MarcoF150

• 14.9 Avg MPG

• Yukon XL

  2018 GMC Yukon XL Denali 6.2L V8 FLEX Automatic 10 Speed
  Added Jun 2022 • 71 Fuel-ups

  Property of ramdad

• 16.6 Avg MPG

• Bubonic (2018)

  2018 GMC Yukon XL Denali 6.2L V8 FLEX Automatic 10 Speed
  Added Aug 2018 • 172 Fuel-ups

  Property of CRHolden

• 14.8 Avg MPG

• 2018 Yukon XL

  2018 GMC Yukon XL Denali 6.2L V8 FLEX Automatic 8 Speed Sport Utility
  Added May 2022 • 67 Fuel-ups

  Property of Brunt

• 25.8 Avg MPG

• My Yukon XL

  2018 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed
  Added Jan 2022 • 67 Fuel-ups

  Property of CamTheMan

• 14.2 Avg MPG

• My Yukon XL

  2018 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2022 • 54 Fuel-ups

  Property of imcalister

• 16.9 Avg MPG

• FLOTUS

  2018 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2020 • 142 Fuel-ups

  Property of mrsmac22

• 16.2 Avg MPG

• My Yukon XL

  2018 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed
  Added Nov 2022 • 6 Fuel-ups

  Property of GR543

• 16.7 Avg MPG

• 2018 Yukon

  2018 GMC Yukon XL Denali 6.2L V8 FLEX Automatic 10 Speed Sport Utility
  Added Nov 2018 • 285 Fuel-ups

  Property of vpoppell

• 17.2 Avg MPG

• Destiny

  2018 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed Sport Utility
  Added Aug 2020 • 76 Fuel-ups

  Property of BlackViper

• 17.1 Avg MPG

• Yukon

  2018 GMC Yukon XL SLT 5.3L V8 FLEX Automatic 6 Speed Sport Utility
  Added Aug 2022 • 16 Fuel-ups

  Property of marcottemw

• 21.0 Avg MPG

• My Yukon XL

  2018 GMC Yukon XL SLT 5.3L V8 GAS Automatic 6 Speed
  Added Apr 2021 • 25 Fuel-ups

  Property of BP1774

• 16.4 Avg MPG

• My Yukon XL

  2018 GMC Yukon XL Denali 6.2L V8 FLEX Automatic 10 Speed
  Added Sep 2019 • 45 Fuel-ups

  Property of triplebts

• 16.2 Avg MPG

• My Yukon XL

  2018 GMC Yukon XL Denali 6.2L V8 GAS Automatic 10 Speed
  Added Jul 2020 • 5 Fuel-ups

  Property of cyber1satan

• 14.4 Avg MPG

• My Yukon XL

  2018 GMC Yukon XL Denali 6.2L V8 FLEX Automatic 10 Speed
  Added Sep 2018 • 48 Fuel-ups

  Property of brycewilliam

• 15.9 Avg MPG

• Denali

  2018 GMC Yukon XL Denali 6.2L V8 FLEX Automatic 10 Speed Sport Utility
  Added Jul 2018 • 9 Fuel-ups

  Property of MS3Jon

• 18.9 Avg MPG