I would be willing to bet 99.9% of people can't. I am in the same boat. I yesterday I forgot to coast one of my best spots because my head was in la la land.
True about the driving - and that's a huge part of most of these guys that get the exceptional mileage.
Something that I've found that helps me - landmarks. I've found some on all the significant coasting spots and used them for about 2 weeks. If I'm in la la land and pass it, I think "hrm, that sign....AH engine off!!!". Picked that up from krousdb after I read about some of his observations about coasting speed. Also, since I don't have any other indication about engine off distance, it helps me keep track of what % of my tank was spent coasting (mileage).
This landmark helper seems to have steadied my results (in otherwise similar conditions). I'm hoping to use this to take out variability as I start to test aero mods.