IMHO all the participants aren't quite discussing the same points.

I'm more than willing to give in on the point that some 4-strokes of the "same power level" burn less fuel their 2-stroke counterparts even if my limited experience with 4 specific engines don't support this (saito 180 vs os 1.60 and .61 K&B vs TT .91 FS).

But we have some people comparing .91 two-strokes to .91 four strokes while at the same time others are comparing .61 2-strokes to .92 four-strokes (and similar).

Let's try to agree on what we're debating.