Quote:
Originally Posted by Chrysler kid
You should see a drastic improvement in gas mileage with your commute being over 60mph. You will also need to make an upper grille block and lower grille block to increase your aero. The rear bumper on these civics is a huge parachute so you will want to create a rear belly pan. With the proper technique and aero you should start easily getting 50mpg tanks. I spend the majority of my time in 4th gear until I'm over 45mph
At over 60mph my car feels like its dragging a parachute because of lean burn and that drag created by the rear bumper. You should also see if you can increase your aerodynamics by following a safe distance behind an 18 wheeler. They often accelerate down hills and decelerate going up hill and traffic will pass you as you save gas
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The driver side rear gap looks like it might be relatively easy to cover with a belly panel. The passenger side, not so much, because of the muffler. One of my dreams is to solve this and produce an affordable bolt-on part. For off-road use only.
The "Sergeant" rear diffuser looks interesting, but at $399 it's
way too pricey and trapped heat might be an issue.
Sergeant Rear Diffuser EK9 - RHDJapan
For 96 00 Honda Civic EK9 Sergeant 3DR Hatchback Rear Bumper Diffuser Spoiler | eBay