Originally posted by DemonSVT:
Originally posted by cvkillacontour98:
ive been running 93 on my se for like 3 months now. 87 just doesnt cut it for me. im going to start running 89 and see how that works.


Waste of money, fuel efficiency, and power.

Run the lowest you can!



This is the pure and simple truth. If you keep things maintained, 87 is more than adequate in a standard Duratec. My '96 has never pinged in 87 since it was brand new. All octane does is resist detonation.

FWIW, I got this from a Mechanical Engineering class at Purdue University 25+ years ago: ethanol has free oxygen molecules in it which will help a slight rich or oil burning engine run cleaner at the tail pipe. Of course, the ECM and O2 sensors should catch the rich condition...

'96 SE 2.5 V6 ATX, Willow Frost Metallic 10-hole '84 Mustang 15x7 wheels w/ Dunlop 225/50-15's CSVT air intake components with K&N cone filter Optimized TB Gutted Pre-cats w/MIL eliminators