Yes, I was the one who pointed that out. Avis is franchise operated with a corporate fleet to allow for flexibility regarding one-ways and service swap issues. Rates are set by supply, demand, and estimated mileage. If the demand in Florida drops, for instance, they need those extra cars sent elsewhere to lower the supply and thus protect their rate integrity. So, $10/day to Charlotte or wherever means they lose money once, because someone pays a low rate and puts on very high mileage in a relatively short period of time. The normal one-way unlimited mileage rate, $65/day, would have reflected this, but that's when there are tons of people visiting Florida who would otherwise be clamoring to rent that car. They'll recoup that money eventually when they give the car out to a renter in the deep South at a substantially higher rate, say $45/day.

The AWD codes all charge for mileage, but if you don't use the AWD code, you will be quoted an unlimited mileage rate. The rate can actually be quite reasonable compared to Hertz, National, etc. Try it. NY-->LA is $150/day, free unlimited miles. The bummer is you can't drive 3,000 miles in one day. $150*3 = big money.