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Old 03-29-2012, 10:45 AM   #6 (permalink)
EcoModding Lurker
Join Date: May 2011
Location: Sidney NY USA
Posts: 64

Horse with no name - '00 Ford Mustang Base
Team Mustang
90 day: 20.53 mpg (US)

Orange peel - '00 Ford Focus SE
90 day: 26.83 mpg (US)
Thanks: 3
Thanked 11 Times in 7 Posts
A few years ago I did a mod to keep dirt and salt from getting kicked up on top of my gas tank from the rear wheels. I wondered why they left this open at the factory. I found out, I lost 5 MPG closing off the rear fender wheels at the back. The pumping action of the tires makes the fender wells a high pressure area.

When I put in my rear bumper mod (mine has to cover the gas tank) I left a tunnel on both sides to let the wheel wells vent. I saw a slight increase, and dirt doesn't pile up on the gas tank.

This summer I will try to dial in the rear angle by raising or lowering the rear springs.

Last edited by pjbgravely; 03-29-2012 at 11:09 AM..
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