your complaint was posted quite a while back, but had to comment just incase you still might catch these.
I too had the same sort of situation with my last Avis Rental. I actually didn't realize the tires were bad until one blew on me, as I was pulling out of my driveway, and slowly (5mp most!) turning the vehicle to go. I put it into Drive, and within 2 seconds the tire blew, throwing me practically into the ditch. i was basically right in front of my home, so very thankful about that. it was pouring down raining too, so I would have been in a huge mess had I gone very far. Long story short, they blamed me for causing the tire to blow, being so rude, not caring that i was hurt physically, and telling me if i had purchased the insurance they tried to tell me about, i wouldn't be in this position.
I have never been treated so horribly in my life. To make it even worse, they charged my credit card about $800 too much and b/c they had a signature on file (not for that amount!), my bank re-issued the charge after i denied it. They need to be shut down.