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I am firm believer in belly pans because when I modified the front spoiler on the POS. I lost 1.2 mpg. hiway.
These are speeds over 60mph and make up 75% of my normal use.
Most modern cars are somewhat aerodynamic in thier front FASCIA already and split the wind fairly well. Air damming forces more of air mass to go over and about remaining 3 surfaces and causes highly charged air pocket before car to enlongate and spread out.
Slice it like a knife if you doubt this take a pencil and a dinner knife and pull them through about 5" of water and observe your results. just remember the 1200 activating degrees inside the catalytic converter. I read a post somewhere that they used an over wrap cat to develop hydrogen probbably in unicorn files.
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