Everything i've read has said that a K&N doesn't help mileage much unless your filter is really dirty.. but I swear it helped my dad's truck.
I'm using plexiglass on my bumper and blocking it permanently around 60%. I made 3 aluminum L brackets and bolted them to the bumper which i'm sure you don't want to do to your car but you could probably do it with any type of plastic and some zip ties. Someone cut all the cross ribs out of my HF's grille so I don't have that option unfortunately.
I don't like how he glued his in but here is a how to:
crxMPG.com - DIY CRX Grill Block I really don't think blocking the pockets on the side (where fog lights go) does anything either but I have nothing to support that.
The main reason i'm focusing on aerodynamics first is because I mainly drive this car on backroads at highway speeds:
Quote:
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Originally Posted by http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=29
During stop-and-go city driving, it's estimated that overcoming inertia is responsible for about 35% of the vehicle's resistance. Driveline friction is about 45%; air drag is about 5% and tire rolling resistance is about 15%.
Overcoming inertia no longer plays an appreciable role in the vehicle's resistance during steady speed highway driving. For those conditions it is estimated that driveline friction is about 15%; air drag is about 60% and tire rolling resistance represent about 25%.
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