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Thanks for responses,
I have seen & read about the AeroCivic, bit extreme for my situation, mine is a Fourby and still needs to retain significant off road capability.
Will stick to the front & top only, though may taper the top down a little at the rear for styling.
The plan is to use a solid lip of about 2" and additional 2-3" rubber which will give flex when the tyre may touch it.
The mockups seem to have had some benefit in improving the coasting ability, but I think they are getting this advantage moreso as an addition to the front airdam.
Want to also look at some kind of attachment at rear of wheel arch to direct air coming from road to go under body rather than up into wheel arch, so was thinking of using some heavy rubber coming out from body horizontally and curving down to point to where the tyre exits road contact. I imagine this would act like a bit of a scraper directing some of the air under the vehicle, obviously it wouldn't be touching tyre, I imagine it would be about a 2" gap.
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