HOMEMADE AERODYNAMICS

Could you get a 5mpg increase done with some mods like taping some parts?

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I think 5mpg more could be possible if you close up the entire underside of the car with some light sheets.
Also slightly lowering it.

Check out ecomodder forums, they take this shit to absolutely ridiculous levels.

Yes.
treehugger.com/cars/modified-honda-crx-hf-wins-fuel-economy-competition-with-118-mpg.html

This is the same engine i have in a dx ef hatch and i get 45+ city mpg

Yea people used to do it to geo metros back then to get maximumsuperduper mpg's but it'll make your car look retarded and uggo senpai

Fuck, now I want to know if filling gaps with silicone would get me more MPGs.

I don't care about visible and stupid looking mods but filling gaps would be absolutely an interesting project if it gets me a couple more MPGs.

I'd use tape instead of silicone, in case you ever need to replace a panel or, you know, open the hood.

Of course, for moving parts I'd think of something else but for example around the headlights you could use something more permanent (and silicone is easy to remove in case too)

You'd probably gain more by blocking off all unnecessary openings in the front bumper, for instance. Make sure you get just enough airflow to not have the engine overheat.