Did a search but didn't find anyone posted this yet. Got this in an email from Avis:

Offer of one weekend day free applies to the time and mileage charges only of the third consecutive day of a minimum three day weekend rental on an intermediate (group C) through a full-size four-door (group E) car. Taxes, concession recovery fees, vehicle license recovery fee, customer facility charges ($10/contract in CA) may apply and are extra. Optional products such as LDW ($29.99/day or less) and refueling are extra. Please mention Coupon TUWA058 at time of reservation. Weekend rental period begins Thursday and car must be returned by Monday 11:59 p.m.; or a higher rate will apply. A Saturday night keep is required. Coupon cannot be used for one-way rentals, one coupon per rental. Offer may not be used in conjunction with any other coupon, promotion or offer. Coupon valid at participating Avis locations in the contiguous U.S. (excluding the New York Metro area). An advance reservation is required. Offer may not be available during holiday and other blackout periods. Offer is subject to vehicle availability at the time of reservation and may not be available on some rates at some times. For reservations made on Avis.com, free day will be applied at time of rental. Renter must meet Avis age, driver and credit requirements. Minimum age may vary by location. An additional daily surcharge may apply for renters under 25 years old. Rental must begin by 3/31/10.