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What do your roads look like that you can coast for 2-5 minutes? What speeds are we talking about at these distances?
I drive 90% highway for my commute. At most I do about 30 seconds of coasting before I hit below 50 mph. I find that the effort needed to do this just isnt worth it. At speeds above 50 the air resistance is really holding the car back. Even with pumped up tires you need a pretty nice hill just to keep your speed. The wear/tear on the cluth and engine just is not the MPG in my opinion. Just pay close attention to your foot and don't use more pedal than you need. Allow the car to slow down going up hills and gain the speed back when going downhill.
As for city driving I can see the benefits. One time on a 30 mph road I was able to coast for about 1.2 miles of pretty hilly terrain and finally ended up at a stopsign. Probably a good 2-3 minutes of coasting it was pretty cool.
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