I graduated last year from a program in vehicle design (Western Washington University VRI). It was design from a mechanical stand-point, not the artsy, industrial design per se. We learned, at least for an NA car, that the burn and coast method is a great way to get better mileage. This is normally feasible on long, straight, and lonely freeways. You drive at full throttle as long as you want (normally in top gear to stay in burn-mode for longer) then shut off the car and coast down to whatever speed you want, start the car, and do it all over again.
As mentioned before, pumping and throttle losses are at a minimum at WOT. Your car's engine is least efficient at idle (this is why you turn off the engine while coasting).
Don't do this when it's busy. While you're coasting you don't have any vacuum for brakes....
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