Based on data from 35 vehicles, 2,299 fuel-ups and 586,642 miles of driving, the 2003 Mercury Grand Marquis gets a combined Avg MPG of 17.71 with a 0.16 MPG margin of error.

Any Engine Type 4.6L V8 GAS (31) V8 GAS (4) Any Body Style Sedan (15) Any Submodel LSE (3) GS (12) LS (16) Other (4)

Below you can see a distribution of the fuel-ups with 73 outliers (3.08%) removed.

Following shows the average MPG of each of the 35 vehicles in the system.

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• My Grand Marquis

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Aug 2024 • 19 Fuel-ups

  Property of Thephallking

• 20.6 Avg MPG

• Marquis

  2003 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Jan 2021 • 199 Fuel-ups

  Property of javaman07

• 21.7 Avg MPG

• My Grand Marquis

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Aug 2023 • 45 Fuel-ups

  Property of lambo123

• 18.6 Avg MPG

• Mercury

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Nov 2023 • 33 Fuel-ups

  Property of BlankVHSTape

• 13.7 Avg MPG

• My Grand Marquis

  2003 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Sep 2021 • 10 Fuel-ups

  Property of aneesh977

• 17.5 Avg MPG

• My Grand Marquis

  2003 Mercury Grand Marquis LSE 4.6L V8 GAS Automatic 4 Speed
  Added Mar 2023 • 55 Fuel-ups

  Property of LuckyJarms

• 17.1 Avg MPG

• Chris Merc

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Apr 2018 • 179 Fuel-ups

  Property of coderwolf

• 20.4 Avg MPG

• Mercury Grand Marquis

  2003 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Dec 2021 • 64 Fuel-ups

  Property of randomnote1

• 20.7 Avg MPG

• My Grand Marquis

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Oct 2022 • 22 Fuel-ups

  Property of jlwright

• 19.0 Avg MPG

• My Grand Marquis

  2003 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Aug 2021 • 46 Fuel-ups

  Property of pauleypa

• 21.7 Avg MPG

• Marquis - aCar

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Jun 2019 • 59 Fuel-ups

  Property of vojimen

• 15.4 Avg MPG

• Marquis - aCar

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Sep 2024 • 59 Fuel-ups

  Property of vojimen

• 15.4 Avg MPG

• My Grand Marquis

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Oct 2020 • 4 Fuel-ups

  Property of Hankey

• 21.1 Avg MPG

• Grand Marquis

  2003 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Sep 2016 • 352 Fuel-ups

  Property of Blocbusta

• 17.4 Avg MPG

• Grand Marquis

  2003 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Sep 2016 • 66 Fuel-ups

  Property of jonoates

• 18.0 Avg MPG

• Old Man

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Dec 2019 • 26 Fuel-ups

  Property of yodman

• 19.3 Avg MPG

• Puss Magnet

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Oct 2018 • 44 Fuel-ups

  Property of Reesemfilms

• 16.7 Avg MPG

• Grand Marquis

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Feb 2017 • 121 Fuel-ups

  Property of DMAXUS

• 20.2 Avg MPG

• 2003 Mercury Grand Marquis

  2003 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Aug 2016 • 163 Fuel-ups

  Property of uncledrewski

• 15.2 Avg MPG

• DaBoat

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Mar 2018 • 3 Fuel-ups

  Property of cat-max

• 20.4 Avg MPG

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