Dear Umbra, I currently drive a 2002 Toyota Prius that gets about 40 to 42 miles per gallon on the highway, which is where most of my driving takes place. However, I've recently become enamored with biodiesel vehicles, and specifically with straight vegetable oil (SVO) vehicles. I'm interested in investing in an SVO system fueled by, hopefully, recycled oil from local restaurants. I've looked into your column archives, and in covering the question of biodiesel versus gasoline, you sided with gasoline. However, you've never grappled with the interesting question of an SVO vehicle versus a hybrid. (As there are no …
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