cool things with wheels, since 2006
I read about a startup a few years back that was going to do the same thing. A quick search shows it's still around http://www.filld.com/
Thanks! They are in the San Francisco area, where the wealthy can afford to not drive to a gas station. I doubt this type of business could succeed anywhere but the two or 3 biggest cities where wealthy people can't take the time to gas up, but can afford to be pampered. New York, Washington DC, Chicago, San Francisco.