I'm on the side of the posters that say something along the lines of either a trike or a like a smart car or something. The Smart Car comes to mind, along with any number of hybrids. Also, what should be considered is just how much money is he going to be saving each year vs. how much he's willing to spend on the purchase of and the cost to insure an additional vehicle. And, if he's commuting in an area that has cold weather or rainy weather, he's definitely going to wish he was inside a vehicle for 100 miles.