As the cost of gas soars into the stratosphere, Americans are looking for alternatives to paying three bucks a gallon. Well, how about converting your diesel engine to run on vegetable oil? Sounds crazy but it works. Greasecar of Florence, Mass., sells complete kits for cars and trucks to run on vegetable oil. It’s the perfect gas solution for do-it-yourselfers. Using vegetable oil not only reduces fuel costs (most restaurants are more than happy to get rid of their discarded oil) but it also reduces toxic emissions and recycles a waste product. Imagine how cool it would be to pull into your local restaurant and say, “Fill ‘er up.”