About a year ago Autonet Mobile claimed to be the first internet service provider for automobiles, and stated Avis as one of their clients.
Autonet Mobile works by providing an always-on broadband internet service from a patent-pending, enhanced-reception system that roams cell phone networks for signals and switches seamlessly between connections to provide uninterrupted coverage.
The service is said to work on 95% of US roads, in all terrains and driving conditions; basically, if your cell phone works there, the wi-fi should work as well. Wireless configuration inside the car works just like any other wi-fi setup, so it is no more difficult to set up than wi-fi at your home or office.
Of course there is equipment to purchase and a monthly service fee, but the price may be worth it for the added convenience and entertainment of auto wi-fi!