Can anyone tell me what type of mileage they have been getting out of a set of low profile tires?

that REALLY depends on the exact tire. How low do you consider low profile? My stock Bridgestones only made it to 19K

I've put 13K on my new Kumho MX's (245/40)

It will also depend on the type of driving people are doing; street, highway, autocross???

Go look at the UTOG rating.

The higher the better.

Kumho SPT's ar ok.

yeah, I've heard a LOT of good things about the spt's.

Just be sure to watch your alignment. I ended up with a rear alignment problem and wore through a set of tires entirely too quickly =/