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"you're dumping most of your fuel in a good BSFC region"
Right, makes sense. I'm just surprised that the effect is so large on a car that has lean-burn. I figured lean-burn would minimize or offset the normal pumping-losses penalty you get with most cars, when using a small throttle setting.
It seems to me that the importance of sticking with large throttle openings is largely overlooked. For example, DWL seems to be all about maintaining a low throttle setting. So my hunch is that DWL is not efficient, except to the extent that it's simply another way to say "go slow."
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