First, I absolutely do NOT tailgate, with or with out the TM. I'm the guy who slows down when somebody pulls in between me and the vehicle in front of me. I always keep a safe distance.
And just like Wayne says, you really don't have to follow them close to notice the advantage. The big rigs punch such a big hole in the air it goes back a long way behind them.
And finally, I normally won't do it anyway. I hate following somebody at all. I'm a "gawker" most of the time. I see more hawks, deer, and other creatures than anybody and don't want anybody right in front of me...
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Keith