Rear wheel skirts

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Rear Wheel Skirt on a Toyota Prius

Just as entire vehicle rear ends can benefit from boat tailing, so can individual wheels/tires.

The 2nd generation Toyota Prius has tapered bodywork (in the bumper cover) behind its rear tires that serve this purpose.

Instructions for mod

See user data table below for instructions

User experiences

Please enter your user name and any relevant data in the table

User data
User Name Car Make, Model, Year Cost of Mod Time to Perform Mod MPG Before Mod MPG After Mod MPG improvement guess Instruction Link
Weather Spotter Toyota, Matrix, 2006 $22 USD 10 Hours 43.42 44.02 testing showed a .4 to a .6 MPG I think it is more like .75-1 MPG Weather Spotters Modification Method and test results
MetroMPG Toyota, Corolla, 2007 0.5 Hour 50.24 50.53 0.58%
cons 04 Ranger $10 USD .5 Hour 30 MPG 32 MPG 6.25% (2 MPG) tank to tank testing, truck had huge gaps to cover, making it easier for more mpg improvements than a low sedan
kevlar Truck 30.8 MPG 32.1 MPG 4.2% tank to tank testing, mod performed on a truck so larger gains than cars
Echo-Francis Toyota Echo 2005 5$ 5 Hours Not tested. Echo-Francis Rear Wheels Skirts

Problems / Consequences of mod

  • A few looks from other drivers
  • Difficulty changing flat tire (depends on method of mounting rear skirts)


Forum thread links

- by cfg83

External links

Flow Field Features and Aerodynamic Drag of Passenger Car <<< Page 27, Wheels a major drag contributor