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Most people agree that there's not too much difference in MPG for biodiesel or petrol diesel. Biodiesel has slightly less BTUs, but has higher cetane, and additionally is a better lubricant so your engine will run quieter and smoother. Petroleum based diesel has more BTUs but lower cetane and crappy lubricity (unless you use additives, or blend biodiesel).
HTH!
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'scort no longer- '86 VW Jetta diesel - biodiesel
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