At Avis, get a 2-Day Weekend Compact to Full-Size Car Rental for free via coupon code "TUEA002". (Rental requires a Friday night and must be returned by 3 pm local time on Sunday.) It's the only free weekend rental we've seen from Avis. Taxes and fees are separate and may be substantial. Rentals must be completed by June 30, and some blackout dates apply.
This coupon isn’t valid in Alaska, the New York Metro area, Canada, Puerto Rico and the U.S. Virgin Islands.