On TNN today, there is a "FerrisPalooza". From 9:00 am to 10:00 pm, they're playing "Ferris Bueller's Day Off" over and over again. But anyways, I saw that Ferris's sister drives a Fiero! About 90 minutes in, as she leaves the school, you get a good shot of the interior, plus a bit of exterior as she drives away. Towards the end of the movie, when the parents get home, you get a few good shots of the exterior. It's white, tan interior, SE, has speakers in the seats and a luggage rack. I'm not quite up on all the differences between years so I'm not sure what year it is, but I think it might be an 85.
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"Wise man say, when in doubt, mumble."