Removing underbody trim

[mutsky]

I have a 2004 Matrix XR with the lower trim package that wraps around/under the front bumper, sides, and rear. I'd like to remove the front and side trim
(I keep scraping them on curbs, etc.). Is there a "filler" button (plastic) etc.,
that I can use to fill the resulting holes, or should I use something else. Some holes are round, others are square.

Also, will removing the trim affect my gas mileage (fuel economy)?

Any help you be appreciated.

Thanks.

[tundrat3]

it will not effect your mileage or least very very little. also their are no plugs for the holes. you will have to fill em with some puddy, sand it then prime/paint/clear.
where you from? i want to get the valance and side skirting. id be willing to buy it from ya, if your in canada....