Get Up To 5,000 Delta Miles With Avis Rental

Get 2,500 miles for a 3 day rental when you use coupon code: MUAA078
Get 5,000 miles for a 4 day rental or longer when you use coupon code: MUAA082

Avis Link

Currently, there is no limit to the amount of bonuses that you can get.
Rental must begin by December 31, 2008 to get the miles.