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I don’t know if this has been discussed on here but I happen to see on TV that you can run a mixture of vegetable oil and diesel for fuel on a diesel truck. I don’t know how long this has been going on but seemed interesting and I found a site that has everything you need to get started. What’s funny is you can go to restaurants to get your fuel, I think it cost a pretty penny to get all the equipment in order to clean the oil and connecting the system to your truck but it is something worth reading.
Here’s one site I read with a good amount of info http://www.greasecar.com/