Why is the Piaggio Avanti so efficiant?

[KC135DELTA]

This airplane boggles my mind, It's ugly, sounds worse than a dieing animal yet has the largest cabin in it's class (lear 60 size). And will do 400knts on the same power as a beech craft 200 (850hp/side). Oh and it's under 12,500 pounds and is single pilot certified too.

Why don't we see these efficiencies in other aircraft?

thanks, drew

 

[Tom Nalevanko]

 

[orion]

 

[Tom Nalevanko]