MetroMPG,
A breakdown lane is a South African term. I don't know what you would call it in the US or Canada.
It is a full width lane to the right of the normal driving lane. Used if you get a flat or something. In Texas and Florida we pull over into them to allow faster traffic to pass. They are bound by a solid white line. Great for cycling or hypermiling. :-)
Your 12.5% should be accurate, because you have a very efficient car. If you had zero drag, then theoretically you could coast forever.
I tried pulse/glide with my RV and it was just dumb. Accelerating was hard, and drag was huge, so coasting was very short. I'm guessing that less than 10% of my time could be coasting with my RV, but close to 50% with my Metro. Your Metro is even be better.
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