Should I quit?

I'm an outside sales rep who earns significantly higher than quota. I drive about 2,000-3,000 miles a month. My boss wants us to all drive the same cars. I currently drive an Audi A-6 and get a new car every couple of years. He's going to make me drive one of his company cars instead of giving me a car allowance. I could live with that, except his company cars are Chevy Avio's. I wouldn't even mind a Taurus, but his cars don't even have armrests. I offered to drive my car with no more mileage reimbursements but he's convinced we should all drive the same vehicle, and these won't give the impression that we're making ';too much money.'; BTW I've been offered several sales positions from customers I've called on, so I'm not worried about finding another job.