For some, spring means lighter clothes or an occasion to clean the closets. For Maria Antonia Roa, 31, the gentler weather brings about a drastic reduction in her gasoline and heating bills— which are one and the same. During the winter it costs Roa and her boyfriend about $13 a night to keep their blue Oldsmobile warm— or at least warm enough to sleep in. Pretty soon, they hope to... More >>>