Hello.
I may be wrong, but this is how I look at this approach:
Think about the glow engines, YS four strokes for arguments sake, all related to full 2 meter models.
First there was the 120, then the 140, then the 160 and now the 170 coming.
All the time people have been buying the biggest, most powerful engine available.
You can still buy the YS 120, but nobody is seriously considering this for pattern, because they would have less power than the competitors, and thereby have a disadvantage.

Or you take the biggest available YS engine, put it in the plane, and limit the throttle ATV to 50%.
Nobody is doing that either.

Or, you could install the YS 63, which is an excellent engine for it's intended purpose.
Then you can really save a lot of weight, because not only is the engine lighter, but you only need half the fuel tank size.
But would you want to do that?

I think Chad i right.
People wil still fly the most powerful set-ups, even with shorter flight times, because these set-ups are simply more competitive.

Just my thoughts.
Magne