I used 186,300 mps from a NASA site, but I would defer to MaxQ's figure. If it's got more significant figures it's more impressive*. My handy-dandy conversion to real units site wasn't working (Dang Russkies) so I left it in miles.

*People are 80% more likely to believe you if you quote numbers and 87.3% more likely if you quote more than two significant figures.