Link to video Even with 3.92 gears is got great mpg - 33+ mpg at 65 mph :E. Also of note was the EVIC mpg was low compared to actual, just like the other Ram trucks they tested.
Ok, but as far as I know all the 2 stroke diesels are "old", there are no new ones as far as I know. Also, the article made no mention of 2 stroke diesels, just modern turbo diesels. I can beleive those are the most efficient. The 2 stroke diesels I've operated were far from it.