Avis.co.uk currently have 15% off USA car hire using the code below, the code does actually work as I just booked a car with it.
All you do is enter this code O058500 in the AWD box when booking and the discount will be applied straight away so you can see the difference.
Also I recomend signing up for the Avis Preferred account which is free and a great time saver as you get to skip the que and go straight to the car which is great after a long flight.
15% off with Macy's
- The savings of up to 15 % applies to Avis leisure rates and is applicable only to the time and mileage charges of the rental.
- Offer does not apply to car group X. 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 AWD O058500 to take advantage of this offer. Offer is available for rentals at participating locations in the U.S. and Canada.
- Offer may not be used in conjunction with any other AWD number, promotion or offer.
- Weekly rates require a minimum five day rental period. Weekend rate available Thursday noon; car must be returned by Monday 11:59 p.m., or higher rate will apply. A Saturday night keep and an advance reservation may be required.
- Discount valid on rentals booked by 15/11/12 and checked out between 28/8/12 - 1/2/13.
- Offer is subject to vehicle availability at the time of rental and may not be available on some rates at some times, including some online rates on the Avis website.
- Car rental return restrictions may apply.
- Offer subject to change without notice.
- Holiday and other blackout periods apply.
- 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.