[Packofcrows]

I do -3 to -5 on most of my cars for looooong trips. When tested under heat, it's usually where it needs to be. I noticed better mpg on our Rav4 when i took air out.... havent tested FRS.... will do it in coming week for 3-4 gas tanks.

I'd say -3 to -5 when cold so that there is more surface area=more friction=more loud interior but feels nicer in corners? (grip-wise)