On May 1 I started my blending experiment by adding 5 gallons of filtered WVO to 3/4 of a tank of "dinosaur"-diesel in my 1980 300TD. The only noticeable change was better-smelling exhaust. When the tank got down a little below 3/4 I added 5 more WVO. As of today, May 12, I have added a total of about 20 gallons of WVO and no more dino-diesel. So by now the "blend" must be getting pretty low on dino. Today I may have noticed a slight drop in power going up a long hill- I'm not sure yet, but definitely not unacceptable.