IMHO PHL has crummy cars, crummy roads and a crummy airport. As for reserving a particular car model, it aint easy anywhere, as Hertz has few special non-Ford cars in stock. The best luck I have ever had with "special requests" at Hertz was to call the nice Seattle airport Marriott Hertz guy direct a day or 2 in advance and ask for a personal request. He in turn insures that car is brought over from the SEA airport pool. My favorite car and my nice request was always for a Toyota Camry. I always got one too.
Maybe you can try this nice proven technique if you can find a close-by Phila Hertz "smaller" office, ie not the big airport location.
[This message has been edited by MisterNice (edited 06-28-2000).]