what percentage off the top of a well settled (3 weeks or more) WVO standpipe or cubee is best for blending?
i realize there are many variables but has anyone done any viscosity testing to see when it becomes noticeably thicker? i am using good smelling amber soy from a chinese restaurant.

100% of the clear settled oil off the top can be blended in varying percents with diesel fuel, kerosene, petrol, etc. The VO should settle at the ambient temperature the vehicle will operate to precipitate any troublesome fats and PHO. Set samples of different percent blends out in the cold to see which is best for your winter temperatures.