I just read the following quote "Lewis Hamilton has told Germany's Sport Bild he is not worried that McLaren's long works relationship with Mercedes is at an end following its decision to take over the Brawn team because McLaren will still be using a Mercedes engine, which is "definitely" the best in F1." I am relatively new to the sport of Formula 1. So please excuse me if my questions seem a little naive. Hamilton says Mercedes engine is "definately" the best engine on the field. How does he know? It's not that he drove other team's car as well. So how can he be so sure? 1) In your opinion, how big of a difference in terms of efficiency and power between the Mercedes and Ferrari engine? 2) Is it true that Ferrari cannot work to improve the engine for next season? 3) if engine improvement is not possible and with new rules of no refueling. Racing with an engine that is not as efficient as Mercedes, would greatly affect Ferrari's performance next year! 4) Is there a reason why only Toro Roso uses Ferrari engine? Are they expensive or just simply they are not that great of an engine? Many Thanks! God bless Ferrari in next season!