Originally posted by DemonSVT:
TR6 (1 heat range colder then stock) will drop MPG and worsen drivability. I would recommend putting them in when you are going to run nitrous. If you will run it a lot over the summer then running 1 step colder for the summer is passable. You still will have the above issues.
I would not recommend running them in moderate temperature weather or lower as these issues worsen noticeably.
Well i drive with them everyday, and i get about 26-28mpg. I notice no drivability issues either.
Then again i am in Hardeeville, SC where the high temp. has not been below 90 in well over a month! 
1999 Cougar V6 MTX
SVT UIM/LIM/65mm TB, I/H/E, Fidanza/SPEC III/Torsen, Koni/GC's, 19" Icon wheels w/ Pirelli rubber, NX Wet Kit
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