If all you want is an engine and four wheels, pick an economy car. They're the most popular rental vehicle category in Pennsylvania. As well as all the standard features, they come with perks like superb fuel economy and affordable rental fees. Hop behind the wheel of one and zip around Philadelphia and Pittsburgh without difficulty.If hitting the open road and seeing natural treasures are on your to-do list, lock in a full-size car or an SUV. Pennsylvania has some dazzling rolling hills and forests, so there are plenty of opportunities to get out into nature. These bigger vehicles are suited to adventurers who are into camping, or for those longer road trips that require a more comfortable ride.