I seriously doubt it would even do that. Show of hands, who believes that if for one day per week (which is less than half the average working week), all working, commuting Americans (which is a lot less than all Americans, all of whom also consume petroleum in all kinds of ways) who drive to work (and also drive outside of work, and use petroleum in other ways too) were to commute by bicycle, it would cut petroleum imports from the Persian Gulf by half?