There are Airbags built into the Mirage's front seats - are you not concerned if the Airbags deploy- with the seat covers on, they certainly won't work as intended - and also, couldn't that potentially harm you (ironic)
dspace9 take some time to read through Scratchpaddy's seat cover thread and you'll find the answer to your question.
How do I know? Because I already asked it. The topic has come up several times before with some interesting discussion.