did you take it back to the dealer after you went to the emissions place? will help them narrow down the problem as likely just a loose hose/connection someplace. and they can do the smoke evap test there.
theres a recall for the intercooler I believe. if they get to much condensation you loose power at hwy speed if you stomp on it to pass someone. (you really shouldnt stomp on it in a turbo motor anyway)
the eco motors are awesome and will outrun pretty much any stock v8 truck produced right now. just need to pre spool the turbo before launch. I think the 5.7l tundras are the only ones faster, but they will make less mpg than what your complaining about right now lol.
sounds like you are already doing the lemon process though. good luck! my parents did the lemon law with a jeep patriot when they first put the diesel motor in it. and they still lost a bunch of money.
Yeah man, they blew me off... I called Ford customer service lost my MIND! Long story short I drove 40 mins to the ford dealer they recommend who smelled the smell enough to get me approved for a rental car thru ford customer service... 10 days later gave it back to me, did NOTHING but cleaned my plugs!