Based on data from 55 vehicles, 4,918 fuel-ups and 1,282,691 miles of driving, the 2004 Mercury Grand Marquis gets a combined Avg MPG of 18.52 with a 0.06 MPG margin of error.

Any Engine Type 4.6L V8 GAS (49) GAS (2) V8 GAS (3) Any Body Style Sedan (26) Any Submodel GS (15) LS (34) Other (6)

Below you can see a distribution of the fuel-ups with 694 outliers (12.37%) removed.

Following shows the average MPG of each of the 55 vehicles in the system.

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• Mercury

  2004 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Mar 2018 • 384 Fuel-ups

  Property of srimbey

• 19.4 Avg MPG

• My Grand Marquis

  2004 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Apr 2019 • 274 Fuel-ups

  Property of lbaker_17

• 22.3 Avg MPG

• 2004 MERCURY

  2004 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Jul 2018 • 116 Fuel-ups

  Property of Dick2

• 17.6 Avg MPG

• Mercury Grand Marquis V2

  2004 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Nov 2018 • 231 Fuel-ups

  Property of dbmotors

• 20.3 Avg MPG

• Grandma Kieth

  2004 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Mar 2025 • 12 Fuel-ups

  Property of fuzzyco1

• 24.7 Avg MPG

• Merc

  2004 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Feb 2022 • 11 Fuel-ups

  Property of CordialColt

• 16.0 Avg MPG

• 2004 Mercury Grand Marquis

  2004 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Apr 2021 • 137 Fuel-ups

  Property of stereojunk

• 18.7 Avg MPG

• C Grand Marquis

  2004 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Apr 2018 • 380 Fuel-ups

  Property of coderwolf

• 21.8 Avg MPG

• Marquis

  2004 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added May 2022 • 14 Fuel-ups

  Property of Red0ak

• 30.0 Avg MPG

• 2004 Mercury Grand Marquis- Dad’s

  2004 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Oct 2023 • 11 Fuel-ups

  Property of RichG_001

• 21.8 Avg MPG

• My Grand Marquis

  2004 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Oct 2022 • 36 Fuel-ups

  Property of jihavoh

• 22.1 Avg MPG

• The Beast

  2004 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Sep 2018 • 33 Fuel-ups

  Property of winscbk

• 19.6 Avg MPG

• Intrepid

  2004 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Oct 2017 • 314 Fuel-ups

  Property of dwarfgh

• 19.0 Avg MPG

• Mercury Grand Marquis

  2004 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Dec 2020 • 84 Fuel-ups

  Property of Mommy8

• 22.0 Avg MPG

• My Grand Marquis

  2004 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Nov 2022 • 12 Fuel-ups

  Property of Casserole

• 26.8 Avg MPG

• Luna Blue

  2004 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Aug 2022 • 8 Fuel-ups

  Property of sheltonj

• 25.5 Avg MPG

• My Grand Marquis

  2004 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Nov 2022 • 13 Fuel-ups

  Property of Casserole

• 21.9 Avg MPG

• Merc

  2004 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Jan 2018 • 144 Fuel-ups

  Property of Redhat18

• 18.9 Avg MPG

• The Marq

  2004 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Apr 2022 • 10 Fuel-ups

  Property of Lifty

• 25.1 Avg MPG

• The Marquis

  2004 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added May 2020 • 60 Fuel-ups

  Property of RuneTheWusky

• 16.0 Avg MPG

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