It depends. Do you ever park off of a paved surface? Ever park in an oil stained parking space? I have seen fires started by not having that shield in place, but they were usually because some idiot parked on the lawn instead of the driveway. There was one that caught on fire because he parked in the corner parking space on the roof of a parking structure, and debris (ie: McDonalds bag, napkins, etc.) was under the car, and ignited.
Take care,
-Chris
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