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On my regular commute, I EOC quite a bit - up to red lights, down one long, gentle incline on the way to work. To guess, I'd say my engine is off for 40% of the time and 20% of the miles. By that math, I use something like 10% less fuel vs. idling in neutral at .25gph. YMMV, and my case is much more favorable to EOC than most.
My current work assignment has me commuting on an urban expressway: heavy traffic going 60mph in a 50mph zone, exits every 1/4 mile, etc. P&G opportunities exist, but I don't allow myself to touch the engine kill switch until I've exited the expressway. Traffic is brutal enough without having to worry about bump starting and having no power brakes. Thus, this week, it's been about 5% EOC, adding one mpg at best. Still worth it.
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