That is a false statement. Back in the day they where. At high way speeds the car goes into overdrive and the trany and the axial to the wheels physically lock together so you do not have any huge loss.I don't understand the preference for autos maybe in non stop traffic but you give up a lot of control and about 15% efficiency. Still each to their own I guess.
Also we are quickly approaching a point in time where an Auto will get better fuel millage than an manual. Reason for it is because a computer will always shift at the correct point. A human will not. A computer shift will be better than any human can pull off.
Autos do not lose nearly as much as they use to for the engine to run.
That being said Manual all the way for me. I drive a 6 speed manual for my car and greatly enjoy it. I really only hate it in stop and go traffic where I hardly ever make it out of first or 2nd gear. I believe I been driving a manual for my car since I was 15 and I am 24 now.
The control a manual gives is nice. But like others have said manuals have their place and are really nice when you have to constatelly be shifting.
Oh lastly manual suck for dates. They require the use of both hands....