I was reading your post on alternative fuels. I run my 664 on cooking grease from the local Chinese restaurant. 40 gal cooking oil, 4 gal kerosene, 3 gal reg gas, and half a bottle of Diesel Kleen from Walmart. The Diesel Kleen takes the place of the magic mystery additive. I used an old sump pump on a rope with a hose to a whole house water filter and open top 55 gal drums.