#1) You can't just throw dirty grease in your truck.
#2) 99% of restaurants have a contract with a grease recycling company to pick up their used oil, and once it is put in that companies container (behind the restaurant), removing it is theft (even if the people inside the restaurant tell you it's ok).
#3) My best friends dad owns the largest grease recycling company in Oklahoma, and he is the one that has the Chevy dually I mentioned above. We can fill their trucks all day long for free (including all the big rigs that go over the road), but they don't. We ran the Chevy on the stuff (with the required additive for 22k miles. In that time, we had to replace the fuel injectors 3 times, and it eventually led to even bigger issues. With trial and error we were able to discover that to efficiently run on cooking oil without reliability issues, the quality of the product had to be at or very near "off the shelf" purity. Try pricing that stuff per gallon next time your at the grocery store. They get the used cooking oil for free, and have the ability to purify the oil to that condition on site, and it is still (at this point in time) not cost effective to do so. We are light years ahead of the companies actually selling kits to make your own fuel (which will get no where near the purity needed to use reliably), and we still have big issues with reliability. With them, you make the original investment, they get their profit, and their done with it. Trust me, if there was a reliable way to run a diesel engine on the stuff right now, all the trucks at this company would be doing so. If you have to take the jump to find out for yourself, go right ahead. I'm just trying to warn you. On the positive side, the truck does make a lot more power, and it smells like a frenchfrier at WOT
The even bigger issue is #2) above. Right now there are companies in many states that are fighting to get this enforced with up to a $1,000 fine. The more people start trying to suck out of these containers, the stronger that resistance is going to become. That used cooking oil is recycled, and used in cattle, and other livestock feed across the world. Companies in that market are not going to let people come take their "money" out of their containers.
Brandon
Good luck and happy truck shopping!! 
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