Have any of y'all ever done one of these?

Our local FG boutique shop is putting on a TT that is open to FG riders only. Like most TTs, it's a basically flat course. Not sure the total distance yet, though.

Anyways, what gear would you run? I keep my track bike at 49/18 b/c Austin is pretty hilly, but I'm thinking I might want to gear up for this time trial. What would you guys run?

EDIT: I've never done a TT, period, let alone fixed. Any other advice would be appreciated. I guess you just try and stay aero the whole time?