YEah, I was going to say, the stock Potenzas are about as inexpensive a tire I've seen for a quality, OEM spec item. We've seen folks here on the forum claim more than 60k miles on their originals by ensuring they're properly inflated and observing a proper rotation schedule. FWIW, the originals on mine had been totally neglected by the first owner but still had some life in them at 30k miles. I opted to toss 'em and get a fresh set from Tire RAck.
Well, here's what I did. I found a local place (Belle Tire) that will match the lowest price and then I got a price from Tire rack including shipping and a price from a local place for mounting, balancing and disposal fee. Bell Tire matched it. Total was $330...not as cheap as I would like, but better than the $420 quotes I got elsewhere.
Given the service life of the OEM RE92s, you do realize that you'll save at least 100 gallons of gas over the life of the tire. (Assuming 66mpg stock and factoring in a 8mpg loss posted by HafNHaf). That's more money than a brand new set of tires cost! If saving money is your goal, I can't think of a single rational reason why you would go for anything other than the RE92 on the Insight.
The cost delta between a set of the cheapest of the cheap and the RE92s are about $60 (I.e, ~25 gallons of gas). You would make up the cost difference within a year in gas alone.
Now, if you want better handling and performance, that's a totally different question (and quite legitimate, if that's what you want). If that's the case, I wouldn't be asking about a "cheaper" tire, however....
Sorry...forgot to mention...the $330 was for the OEM tires, including mounting and balancing. I hope everyone knows that tire places have a serious markup on their tires. The fact that they came down to $330 from $420 makes me wonder what their cost really is.