>> that mixture. Attainable power would probably be up to >> 90% >> of what you'd get from 60% as much waste mineral oil. > You meant "or what you'd get" ? ie the water supplies no > energy No. Properly* parsed it yields exactly what I intended :-) up to 90% of what you'd get <= 0.9 from 60% as much 0.6 <= 0.9 * 0.6 -> <= 0.54 ie I'm saying that the waste mineral oil provides all the energy, as it's 60% of the mix you'd get only 60% contributing, and the 90% says it would be worse than if water was mixed AND alludes to the 90% pure water elsewhere. R * according to my brain's current rule set. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist