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I'm probably not much help but take a stab anyway. On my motorcycle I use tires categorized as "touring" as they are usually designed to wear longer. I have no idea on rolling resistance but I'd guess they are better than sport rubber due to the lower heat generated. They also last alot longer reducing the life-cycle cost of owning the bike. It's worth a shot looking for touring tires anyway.
On the ragged edge of sanity, consider car tires like for the original Mini Cooper. They had 10" rims as well but I'm sure the width is greater than 90, it was probably a 145 or something.
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