Thanks John.
Ph.D. Michael E. Wysession's Great Courses lecture series on energy, I believe, came up with an average 15% overall thermal-mechanical efficiency for internal combustion vehicles, so your numbers are spot-on according to his research.
In nine years, some carmakers will have already put all their pistons out to pasture.
Cutting BSFC by 66% is a smart move.
Get rich slow.
