Hello Sammies, here is the info, so it took so long,

if you have 1 gallon of fuel and it has 12% or already mixed from factory and you add castor to your 1 gallon of NEW fuel, this is what you would have total.

adding castor will total, so it is not much percent change..
.
10 mil - 12.2%
20 mil - 12.5%
30 mil - 12.7%
40 mil - 12.9%
50 mil - 13.1%
60 mil - 13.4%

Billy