[newhavenpatriot]

I'm looking on tirerack.com and it says that the 175/65R14 Potenza RE92 tires have a max. PSI of 50. Would this be better than the Insight tires everyone is talking about, or worse, in terms of rolling resistance? I only ask because the Insight tires (165/65/14) won't fit on my Yaris (I don't think they will, at least). My current tires are 185/60R15 Potenza RE92, with a max. psi of 44. Do you guys think it'd be worth it to switch to the smaller sized, higher PSI ones? Would it be possible to get those "Insight tires" on there? I'm really new to this ecomodding thing, and I know next to nothing about cars, so if anyone could explain the difference between these three tires, I'd be grateful.

EDIT: My car is supposed to be able to take either 185/60R15 or 175/65R14, or at least that's what Google tells me.