Based on data from 22 vehicles, 1,444 fuel-ups and 390,898 miles of driving, the 1999 Mercury Grand Marquis gets a combined Avg MPG of 19.48 with a 0.16 MPG margin of error.

Any Engine Type 4.6L V8 GAS (15) V8 GAS (7) Any Body Style Sedan (8) Any Submodel GS (5) LS (10) Other (7)

Below you can see a distribution of the fuel-ups with 81 outliers (5.31%) removed.

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

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• Grand F150 Marquis

  1999 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Sep 2024 • 4 Fuel-ups

  Property of OILBURN3R

• 15.4 Avg MPG

• Steve

  1999 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Mar 2022 • 201 Fuel-ups

  Property of m_zacek

• 18.0 Avg MPG

• The Merc

  1999 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Sep 2017 • 60 Fuel-ups

  Property of Chrome_Daddy0

• 18.6 Avg MPG

• Bessie the Battleship

  1999 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Feb 2018 • 271 Fuel-ups

  Property of KWestra

• 21.2 Avg MPG

• Merc

  1999 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Jun 2019 • 319 Fuel-ups

  Property of MWcars

• 19.5 Avg MPG

• Etco Mercury

  1999 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Apr 2023 • 51 Fuel-ups

  Property of nettlette

• 21.9 Avg MPG

• The Grand Marqis

  1999 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Sep 2017 • 164 Fuel-ups

  Property of Boutit

• 18.9 Avg MPG

• My Grand Marquis

  1999 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Feb 2022 • 9 Fuel-ups

  Property of MandoMillionz

• 17.7 Avg MPG

• Mercury

  1999 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Jun 2012 • 103 Fuel-ups

  Property of Dick2

• 18.3 Avg MPG

• The Grand

  1999 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Mar 2017 • 28 Fuel-ups

  Property of gvettel

• 11.8 Avg MPG

• My Grand Marquis

  1999 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Oct 2016 • 26 Fuel-ups

  Property of dbbuie

• 21.0 Avg MPG

• Grand Marque

  1999 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Feb 2019 • 112 Fuel-ups

  Property of dragonboysx

• 22.8 Avg MPG

• Marc's Grand Marquis

  1999 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Aug 2016 • 189 Fuel-ups

  Property of sortlane1

• 22.0 Avg MPG

• Pimpmobile

  1999 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Aug 2014 • 61 Fuel-ups

  Property of Technocrsr

• 23.0 Avg MPG

• 1999 Grand Maquis

  1999 Mercury Grand Marquis GS 4.6L GAS V8 Automatic 4 Sedan (4 Door)
  Added Dec 2014 • 11 Fuel-ups

  Property of rednwhitecooper

• 19.4 Avg MPG

• MY GOLD MERC

  1999 Mercury Grand Marquis GAS V8
  Added Jan 2013 • 41 Fuel-ups

  Property of nickpatton

• 20.4 Avg MPG

• The Car

  1999 Mercury Grand Marquis GAS V8
  Added May 2013 • 14 Fuel-ups

  Property of patland54

• 23.3 Avg MPG

• Grand Marquise

  1999 Mercury Grand Marquis GAS V8
  Added Jul 2012 • 5 Fuel-ups

  Property of on4now4

• 22.7 Avg MPG

• Marquis

  1999 Mercury Grand Marquis GAS V8
  Added Nov 2011 • 10 Fuel-ups

  Property of sommmatt

• 17.8 Avg MPG

• The Land Barge

  1999 Mercury Grand Marquis GAS V8
  Added Sep 2011 • 18 Fuel-ups

  Property of parkavenue

• 19.2 Avg MPG

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