Not much of a discount. Looking at diesel prices in Ft Worth, they average between $4.20 - $4.50 per gallon.
So, other than eliminating a little "French Fries waste", it doesn't seem like you really save anything. Unless you lived across the street from the $4.50 a gallon station and didn't drive anywhere else where you could get it cheaper.
I have come to realize the same. The retailers I've contacted this week are charging close to and sometimes more than regular diesel for biodiesel,, WTF! So I guess unless you are really interested in being green, or have the start-up money to buy a processor and the accounts to get WVO, biodiesel doesn't make finacial benefits.
I figured biodiesel was being produced from WVO that was being obtained at low cost (if not free) from local restaraunts. No oil wells to maintain. The transportation cost across town from pick up point to manufacturing site and to retailer would be much cheaper than a ship across the ocean and a semi-truck across the US to every gas station on every corner of every city. The processing company is much smaller and would have less overhead.
And the whole principle idea of telling the big oil companies to F-off we are tired of your high prices!