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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• Jamie Merc

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Apr 2018 • 7 Fuel-ups

  Property of ladyamalphia

• 24.6 Avg MPG

• Marquis

  2003 Mercury Grand Marquis LSE 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Aug 2013 • 266 Fuel-ups

  Property of IH8regs

• 18.7 Avg MPG

• Grandpas

  2003 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Apr 2015 • 27 Fuel-ups

  Property of Rambo032610

• 20.2 Avg MPG

• Mercury

  2003 Mercury Grand Marquis LSE 4.6L V8 GAS Automatic 4 Speed
  Added Mar 2017 • 340 Fuel-ups

  Property of nolafaye

• 16.9 Avg MPG

• Grand Marquis

  2003 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added Sep 2016 • 68 Fuel-ups

  Property of shifter

• 21.0 Avg MPG

• Murked

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Dec 2015 • 26 Fuel-ups

  Property of mcodeath

• 19.4 Avg MPG

• My Grand Marquis

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed
  Added Dec 2015 • 12 Fuel-ups

  Property of defflepp1

• 15.3 Avg MPG

• The Tank

  2003 Mercury Grand Marquis GAS V8
  Added Jan 2014 • 39 Fuel-ups

  Property of eiskusma

• 14.7 Avg MPG

• Chris

  2003 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Oct 2014 • 24 Fuel-ups

  Property of drumman28

• 18.2 Avg MPG

• 2003 Grand Marquis LS

  2003 Mercury Grand Marquis LS 4.6L V8 GAS Automatic 4 Speed Sedan
  Added Apr 2018 • 69 Fuel-ups

  Property of ddrwilli

• 21.5 Avg MPG

• BulgerMerc

  2003 Mercury Grand Marquis GAS V8
  Added Jul 2013 • 20 Fuel-ups

  Property of panthermerc47

• 21.2 Avg MPG

• MGMLSP 4G Panther

  2003 Mercury Grand Marquis GS 4.6L V8 GAS
  Added Mar 2011 • 197 Fuel-ups

  Property of JHEATHJR

• 19.7 Avg MPG

• MGMLSP 4G Panther

  2003 Mercury Grand Marquis GS 4.6L V8 GAS Automatic 4 Speed
  Added May 2015 • 47 Fuel-ups

  Property of JHEATHJR2

• 21.7 Avg MPG

• B's Car

  2003 Mercury Grand Marquis GAS V8
  Added Aug 2008 • 3 Fuel-ups

  Property of povia

• 18.2 Avg MPG

• gray ghost

  2003 Mercury Grand Marquis GAS V8
  Added May 2011 • 16 Fuel-ups

  Property of chickenfoot

• 21.3 Avg MPG

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