edub32, The only mod I've done is to install a filter on the suction side of the switching solenoid to prevent any contamination from entering the system and fouling the switching solenoid and or pump. Other than that the truck is stock. I cannot tell any difference between the two fuels as far as operation goes. The winters here are mild, rarely below 32°. Still the oil travels through the hoses/tubes OK. I can tell when its time to change the primary fuel filter because acceleration will fall off and my top speed decreases when it is dirty.
Hope this helps.