Fleet car options are really quite good and there are a lot of them. I'll try and get most of them down from memory. Volvo SC 60 SUV(4 cylinder turbo), Toyota Highlander, Toyota Prius, some buick model and a chevy/gmc small SUV.
Car allowance varies by how many miles you drive a year. The base amount is around $550 per month and then about 34 cents a mile for business miles. It's a pretty good allowance.
It's a great company to work for. I've been here for a little over 4 years and culture is really good, pretty transparent and they seek input from the field before making big decisions. They even sent out surveys for fleet vs. allowance and then decided to give us both options.
Remember all pharma sales jobs and the happiness you enjoy when working such a job is heavily dependent on your manager. Make sure you interview your potential manager as much as they interview you.
Good luck in your job search. I being a N of 1 can honestly tell you I love working here and I've been in the industry for a pretty long time and have worked at 4 other pharma co's.