Dunno. If we are talking about a national fleet of new vehicles, seems the new a/ts are pretty much the equal of m/ts as far as EPA tests go.
So then the big variable is the driver... so many of them with their heads up their.... they're better off with a/ts; then the slightly better than average driver might have equal mpg with either one; then the slim minority that are hypermilers or near hypermilers would be the ones to really make the m/ts shine.
So as a national fleet, with the current crop of dumb motorists, I think a/ts might have the edge.
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