My assumption is there is a context difference. Efficiency in fuel/mile. Efficiency in Power output/liter of displacement. But that is just my assumption. Yo

My assumption is there is a context difference. Efficiency in fuel/mile. Efficiency in Power output/liter of displacement. But that is just my assumption. You can have a relatively small engine and force a ton of air/fuel into it under boost and get tons of HP but it tends to lose the ability to maintain fuel economy. Tune it for fuel economy and it tends to lose power. It is very difficult to have both in the same package for many reasons. Adding mods like discussed in the article start to allow for the overlap to be wider.