I know it helps save the VP44 pumps but what about a P7100? I think it would be beneficial but I would like to here from those with more experience on the matter. If it is a good idea, what ratio of oil to fuel should I use? Just for clarification there is nothing wrong with my pump, I'm simply looking at preventive maintenance practices. 

When you test the fuel pressure hook up a gauge and then go drive the truck. We need to know idlng pressure then WOT pressure at highway speed.

Still need to know if there is any error codes too...

Mike when you say at highway speeds you talkin 4th gear locked? I've never been able to do that without unlocking the TC.