If I mount 195/55/15 with 45psi press in the rear instead of my standard street tires 225/45/16?

 

ummmm?

 

less roll resistance, you get me?

 

maybe a tenth or two. are you mounting them on the same rims that the 225s came off of or different rims? right now i run 195/50-15 and i am going to try some rims with 175/60-13 tires at 40-45psi in the rear.