Re: Twins are the most powerful.
It had an upside, though, takeoff's in 757s were impressive. It only needed 80% thrust normally, but if the pilot got permisison to use 100% for weather or similar reasons you really noticed that kick in the back :)
Ah, the majority of 757s ended up with Rolls Royce's engine. The thing is is that RR offered a derated RB211 - it was significantly over powered for the 757. Of course they didn't derate it down to the minimum power required for the aircraft, they made sure that it still had plenty of get-up-and-go.... Frank Borman, the famous astronaut and President of Eastern Airlines said that the 757's RB211s were the finest aero engines ever made.
The 757 in general was responsible for the development of ETOPS, and laid the foundation for the modern airliner industry. A very significant piece of work indeed.