Who has the highest mileage on their Fazer?

[His Dudeness]

What are the symptoms? High oil consumption? Low power?

Over 90 BHP from 600 cc is a lot - no wonder they don't last nearly as much as an average car engine, which gives half the HP, in double the cc capacity.

That's only a guess based on what the other lads have experienced. I wouldn't be too worried about it. Sure an engine could be a write off after 10,000 miles if it's been badly treated or it could keep going forever if you're willing to put money into fixing it. Just depends on when you think it's not worth fixing.