A recent post asking about tire sizes, and a reference to a Miata site, made me do some thinking & a tiny bit of work.
So, I made a couple of Excel spreadsheets, then published them as interactive web documents.
Can somebody try one of them and see if they work for you. I would be especially interested in both PC and other type computers (Macs, Linux, etc) and even more so if you don't have Excel. They work for me but.....not so sure about my skills. If they work I may try to pretty them up. One does the tire size comparo thing, the other determines how many times you would have to do a drain and refill to get some percentage of clean fluid.
Anyway if interested look here:
http://www.subaru-svx.net/photos/user.php?lee