Good post, I have to keep reminding myself that I live on a dirt/gravel road now and should be changing my filter more frequently.
I think 3 mpg is a pretty big difference myself.
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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