A little off topic but... No matter what external data is available I think it's unlikely anyone could determine an accurate RTP of any given game/denom without doing extensive testing or seeing the payback screen. But we should be able to get some idea of if one casino pays better overall relative to another. I've always felt it's reasonable to assume VP paybacks should give you a pretty good idea, better VP RTP then likely better slot RTP. But someone correct me if you think I'm off base here.