I don't have a turbo but do have a JRSC w/6 lb's of boost. The car has about 30k on it now with 20k of it boosted. It's my daily driver and usually sees boost (cause it's fun). The car runs real well and hasn't given me any problems. If I drive aggressivly I get about 28 MPG, if I take it down a notch I get about 31 - 32 MPG. I check my mileage on every fill up.
SVT with JRSC @ 5-6psi for 5000 miles now. No problems other than the throttle/cruise control bracket snapping on me twice...but that's not really a problem with the car, just a bracket supplied by JR.
Oh wait I take that back, I have had power steering go out on me twice...not sure if I'm breaking something lose with hard driving or if its the S/C
Too much timing on 91 octane. I pulled 2* on the chip (the original one) and thought the deto was gone. Guess it wasnt. The current program I have now is alot better but w/o the J&S, Im sure I would have scattered another one by now. 91 just isnt cool with the zetec's aggressive midrange timing.
Brad - No, I don't remember every reading anything about it. I saw you write "pop goes the zetec" before, but I thought you meant "pop" as in the sound of deto occuring, not rod snapping or piston holing - that's too bad.
Edit: Did a search. OK, now I remember, thought that was someone else.