Based on data from 19 vehicles, 1,039 fuel-ups and 249,517 miles of driving, the 1998 Mercury Grand Marquis gets a combined Avg MPG of 16.33 with a 0.18 MPG margin of error.

Any Engine Type 4.6L V8 GAS (17) V8 GAS (2) Any Body Style Sedan (7) Any Submodel GS (5) LS (12) Other (2)

Below you can see a distribution of the fuel-ups with 127 outliers (10.89%) removed.

Following shows the average MPG of each of the 19 vehicles in the system.

• My Grand Marquis

  1998 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Mar 2020 • 101 Fuel-ups

  Property of Sctt

• 20.0 Avg MPG

• My Grand Marquis

  1998 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Sep 2022 • 9 Fuel-ups

  Property of mattkatrina

• 19.8 Avg MPG

• Aquatic Life

  1998 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Oct 2017 • 141 Fuel-ups

  Property of DJamesShaw

• 20.5 Avg MPG

• Silver Fox

  1998 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Dec 2021 • 3 Fuel-ups

  Property of Meyj81

• 24.9 Avg MPG

• My Grand Marquis

  1998 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Sep 2021 • 3 Fuel-ups

  Property of 98marquis

• 18.5 Avg MPG

• Mercury

  1998 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Jun 2017 • 42 Fuel-ups

  Property of mattjohnson52

• 16.6 Avg MPG

• BigWhiteBoat

  1998 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Jul 2018 • 56 Fuel-ups

  Property of DesertBike

• 16.4 Avg MPG

• My 1998 Grand Marquis

  1998 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Oct 2018 • 19 Fuel-ups

  Property of drel26

• 17.2 Avg MPG

• Silver Merc

  1998 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Mar 2013 • 99 Fuel-ups

  Property of BanditAbarth

• 17.2 Avg MPG

• My Grand Marquis

  1998 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Jun 2017 • 3 Fuel-ups

  Property of CMarrero

• 8.9 Avg MPG

• Grand Marquis

  1998 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Nov 2015 • 10 Fuel-ups

  Property of Glease

• 17.5 Avg MPG

• 1998 Marquis

  1998 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Apr 2018 • 73 Fuel-ups

  Property of Cyber-Wizard

• 18.9 Avg MPG

• 1998 Marquis

  1998 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Mar 2021 • 73 Fuel-ups

  Property of Cyber-Wizard

• 18.9 Avg MPG

• Grand Marquis

  1998 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Oct 2016 • 314 Fuel-ups

  Property of larryo340

• 15.0 Avg MPG

• Mercury

  1998 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Sep 2016 • 36 Fuel-ups

  Property of merv3907

• 13.0 Avg MPG

• Merc

  1998 Mercury Grand Marquis GAS V8
  Added Jan 2013 • 3 Fuel-ups

  Property of 300hp

• 20.8 Avg MPG

• Mercury Grand Marquis

  1998 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Oct 2016 • 215 Fuel-ups

  Property of gham

• 19.3 Avg MPG

• Merc

  1998 Mercury Grand Marquis GAS V8
  Added May 2012 • 10 Fuel-ups

  Property of SirRiec

• 19.5 Avg MPG

• Grand Marquis

  1998 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Aug 2016 • 35 Fuel-ups

  Property of diagnostuck

• 20.8 Avg MPG