Yes, I've been flying 5.00X5 tires without wheelpants since last summer. The change today was from no wheelpants to wheelpants. It was a greater improvement than I expected. I should look for some more drag reduction items!

Maybe I was doing 160-165 knots with the Lamb tires and pants too, but it's too far back to remember. I might have a written data record from the time I first installed the PSRU/prop.

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Post script,
  I think I missed something........Have you been flying without wheelpants
since last summer?? I thought you had just switched from lamb tires and
pants to the 5.00x5 tires and Vans pants........daaaa
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Kelly Troyer
Dyke Delta/13B/RD1C/EC2