Has anyone here ever used adsense on a site with racing content, and if so, care to share what the ballpark RPM is?

Years ago we bought a racing info site from someone that did decent adsense revenue, but we merged it in to a racing site and never asked what the RPM was and now I'm curious.

Obviously I'm aware it will vary, so just looking for rough figures (eg: is it $2 or $200).