35% is a lot FOG I agree with Mark GST sounds about right.
Worked in the oil field hauling crude oil out here and remember the Canadian trucks hauling crude oil down here. The crude gets real thick the father north you go, from what I understand the oil has to be heated to get it out of the ground and the Canadian trucks would haul our crude oil back home so they could mix it with there's to get it to go down the pipe line.
The crude down here from what I was told is the best around. But I have no idea how true that is.
Many well sites has sweet crude that looks like light beer and trust me when I tell you I have put it in my scamps fuel tank and without mixing it with gas and my car loved it the only problem is it would diesel when you shut it off sometimes like the old days fuel.