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As a side note, the B381 tire which is known for the lowest rolling resistance in the old test was a 185/70-14 tire with a 5" tread width. The 185/65-14 version has a 5.4" tread width (almost certainly higher rolling resistance). The tire also has a B rating for wet traction and a B rating for tread wear.
It seems like tread width has a very large (if not, the largest) impact on rolling resistance.
The Kumho KH30 in my size (185/65-14) has a 5.2" tread width with an A rating for wet traction and an A rating for tread wear. I think I've zeroed in on my tire. Going to get the new wheels and tires within the next few weeks. If I end up getting them, I'll try to give some first-hand input on the Kumho KH30 tires, although I don't really have the time for any halfway scientific testing these days.
JMac
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