This is why I said you can't always go that slow. But my commute is a rather short trip (~15mi one way) and my best route mostly consists of deserted back roads
So I can really expend a few minutes a day on a hobby, which happens to be hypermiling
But I wouldn't go that slow on busy main roads or longer trips. I'm also faster with Teresa, because her 5th gear is practically unusable below ~45mph and she rewards P&G over 45 with a few more mpg. Even 75-mph pulses aren't heresy with her.
It depends on many things.