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People I've talked to said that they didn't notice any drop in mileage, due partly to the added top end lubrication of bio-diesel.
But even if it's a 10% drop in mileage (haven't heard anyone have that happen) it's still a 100% reduction of petroleum diesel and oil crops produce enough oil that farmers can grow their own fuel, press it on site and come out ahead, from what I remember energy input in to making bio-diesel was less then 10% of what you get out of it, corn ethanol is no where near that efficient.
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