My thoughts
I have two sets of client groups - very very local and relatively distant with one in New York City. Very local count as 15 min away, so I don't even bother. But distant is about a 40 minute drive, with a caveat in that three happen to be in the same small medical complex so they pay for each other. Two more are within 5 min of this building. Manhattan is a once-monthly and I have factored train and subway into the equation. But it is the price of gasoline, compared with 3 years ago, that hits directly and I am considering such a line item addition for 2012 contracts.