aaron_b_b

I've been running 93 ever since I've had my car. Theperformance was awesome at bone stock. I dropped in a K&amp;N filter, installed an o/r Xpipe and a Magnaflows. I still use 93 and it "PUNHCES" even harder... <IMG src=smileys/smiley14.gif border="0"></P>


Hmmm, should I be using 89? hmmmm! </P>

vfast

89 is all you need with a near stock car...
take the car back and have then check the timing,fuel pressure,spark..all they do it check codes, these items may not trip any codes. also check your gas cap I know is sounds funny...

03WhiteGT

y doesn ford say 2 run 87 in ur car and not 89 if 89 is better?? or is it really better??

Jugador1

nah...octane doesnt mean performance. higher octane is needed when you're running high compression, get pinging, or are running boost and stuff so the gas doesnt detonate before the spark...(right?)

w11988

03WhiteGT:</P>


Go back and read a thread titled octane. It's only a week or so old. There is a lot of good info in the thread regarding what octane numbers really mean and what the number means for performance, or lack of performance in some cases. I learned a lot when reading it.</P>