Dug up this thread from a few weeks ago...
Wouldn't programming the engine to "engine brake" with an open throttle allow a form of easy pulse and glide on a manual transmission?
The overall frictional loss would be equivalent to that of leaving it in gear, but operating it at a high load part of the time and then having the engine just pump air the rest of the time could (could being the keyword) be better than engine on coasting...
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