Old Smokey,
That's pretty close to the money. I am pleased to say that at least one well known operator selected 1.5 G, even 1.3 was cutting it fine, and 1.2 is just too touchy, with rumble in still air in moderate turns.
The theoretical fuel saving between 1.3 G and 1.5 G limits was never demonstrated in practice, in the real world.
Tootle pip!!