Here are the details for this coupon:

Coupon valid on an intermediate (group C) through a full-size four door (group E) car. Offer may not apply to all makes and models. Dollars off applies to the time and mileage charges only on a minimum five day rental period. Please mention MUWA191 coupon at time of reservation. A Saturday night keep is required. 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. An advance reservation is required. May not be used in conjunction with any other coupon, promotion or offer. Coupon valid at participating Avis locations in the contiguous U.S. Offer subject to vehicle availability at time of reservation and may not be available on some rates at some times. For reservations made on Avis.com, dollars off 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 12/31/12.