You would save that pretty easily in not having to write separate software/everything for the US and for the rest of the world. Not to mention things like http:

You would save that pretty easily in not having to write separate software/everything for the US and for the rest of the world. Not to mention things like http://articles.cnn.com/1999-09-30/tech/9909_30_mars.metric.02_1_climate-orbiter-spacecraft-team-metric-system?_s=PM:TECH http://articles.cnn.com/1999-09-30/tech/9909_30_mars.metric....