david97gt46 said:where you guys getting ONLY 91, in FL its 93?. I have to use 93, its 100+ here most of the yr, and i autoX the crap out of it. my wifes 01 honda oddyessy even runs better on the 93(honda claims +10hp with 93).
Dr. Black said:A while back motor trend did a study on octane, used several cars, honda, saab, MUSTANG GT... with each car used the recomended fuel (mustang 87). Did dyno test for hp and tq, and a gas milage test. The mustang made less power and got less miles per gallon with 89 and 92 than with 87 (not by much but stll worse). I would not use higher octane gas unless SC or Turbo or other major type of performance mod.
Hope this helps. (remember your cars computer was designed to run with 87)
2000GT said:That's correct, but yet you continue to see people waste money on higher octane. Gas companies love those people.
Higher octane is not necessary until you change your timing curve.
I am sure someone will debate this.
Mustang_1 said:I use 91 in mine, if I use anything less I ping, but I also have several mods, I wont use 89 cause it is blended, ethenol, which is part grain water, I work for a auto dealership, we recommend people to not use in there cars, exspecially during the summer, you want to see vapor lock, also eats fuel regulators.
NiteMareGT said:HERE'S THE DEAL !!!!
UNLESS your timing has been bumped UP FROM THE FACTORY SETTING, or you have an AFTERMARKET CHIP that has reprogrammed your vehicles fuel octave rating, you are WASTING YOUR MOOLA on higher octane gas, and you are HURTING YOUR CARS PERFORMANCE and HORSEPOWER !!!! This is not an opinion, this is a FACT !!!!
98stallion said:you'll get less power more than likely. the most power you'll get is by running the lowest octane possible without detonation