Downsized from 19" to 17" and somehow... ride quality is worse?

I bought the 215/55R17s specifically to match the original diameter - the difference is less than 0.4" (26.7" vs. 26.3", for 195/50R19 and 215/55R17). I would have gone for 225/55R17 for the speedometer's sake which would be a perfect match to the original, if I could have found it locally with a good rim set (and at the right price). The sidewall has also increased by more than 1" inch.

Also, I don't appreciate the insinuations and assumptions about motives. The CC2's have one of the lowest rolling resistance numbers out of all others in the all-weather category - which is the only category I'm considering for new tires given the increasingly unpredictable weather up here in Canada. It is also consistently in the 5-10% of all-season tires for rolling resistance. I'm actually not sure if Toyota bothered to supply LRR tires on the 19 rims (perhaps on the Ecopias (?) on the OEM 17" rims), but even so I would not be surprised if there's very little difference between the CC2's and the OEM Toyo Extensa's A/S II, if not the CC2'S being better.

And contrary to the insinuations, I chose the latest Prius specifically for fuel economy, increased pure EV range compared to previous gens, and partially the interior features (I'm the kind of guy who really doesn't care how the exterior looks - IMO, the Gen4 might even look slightly better but I digress).

(Is it the most frugal choice to buy new? No, but it also wasn't mine to have someone total my last car and their insurance to give a nice payout. Besides, if we really want to talk frugal these days, you might as well consider transit and a Uber. Buying a car has never been the most effective use of money anyways - probably the fastest depreciating asset out there with little hope of return. Neither is it frugal to ignore getting a set for winter weather in Canada - it is simply dangerous. Doubly so as the stock Toyo's have been reported to have basically no traction even in light snow)

Honestly, I'm shocked posters here would be getting even the basic facts wrong, given how much previous discussion there's been about 17" tires including switching to the CC2'S specifically. The piling on to claim the bad experience is simply my mistake to deviate from the OEM tires is completely non-sensical, even from an objective point of view. To date, I'm the only one who has reported on the webs that the 17" tire/rim combo yields worse of a ride and worse fuel economy. Everyone else including quite a few on this forum have reported improved ride quality (even if some qualify it with just "slightly") and more than 10% increase in Mpg with the CC2'S specifically.

 

You have might have had good luck - and in any case, you do you - but in general, it's a pretty bad idea to overinflate tires to ~45 psi in hopes of getting better fuel economy. The numbers show that there is usually only a 1-2% improvement in MPG as the tires are simply not designed to yield more just by overflating them that high. Plus, the opposite of your experience is usually true, with much worse, uneven treadwear and higher safety risks. If there's any car myth that should die, it's that overinflating tires is a good idea to get better fuel economy. You would save more from avoiding to have to replace tires earlier or worse, causing an accident.

...I will leave it at this, since I'm honestly astonished that this discussion could devolve into attacks/judgements of character and such disorderly conduct, but are you the same person who wrote this?

Perhaps we should just keep the judgements and assumptions to ourselves.