Here is the original posting from Dave on the use of mixed (diesel/gasoline) fuel form the Deuce forum:
"Don't know what its like in the States, but in U.K. we get drivers filling diesel cars with petrol, and petrol cars with diesel, by MISTAKE. When this happens the vehicles have to be towed in, and the tanks pumped out by the recovery firm. This fuel is know good to any body ,but to us with multifueler,s, theyare just glad to get rid of it for free.
I have 200 gals of this stuff, and a chemist friend of mine has devised a graph to show ratio of petrol to diesel (I run on 60% diesel). You need a couple of hydrometers to measure specific gravity of mixed fuel, look up on the graph and find what percentage of diesel there is. I have another graph that tells how much diesel to add to bring it up to 60%. The fuel I get is usually about 80% petrol."
If I read Dave's chart and post correctly, I'd first use the relative density chart to determine the amount of diesel in the diesel/gasoline mix. I.E., if the specific gravity of my mixed fuel is 0.800, then my mixture is 50% diesel and 50% gasoline. Then I'd use the second chart to calculate the amount of diesel I need to add to the mixed fuel to bring it to 60% diesel. In this example, at a 50% diesel/50% gasoline mix, I'd need to add 250 ml per litre of mixed fuel to bring the total volume to 60% diesel/40% gasoline. Am I reading you correctly, Dave?
On a related note, does anyone know what percentage of filtered waste motor oil can be safely run in a multifuel? Would that percentage be temperature varient? Dave - can your chemist friend come up with a similar set of charts for blending diesel/WMO?