V6 (1994-2004) MustangsTechnical discussions on the 3.8L and 3.9L V6 torque monsters Sponsored by Optima Batteries
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So now that I have the money for a real good tune I was wondering what octane to use? I know everyone says the higher the octane the more power you get but is it really worth spending an extra $2-3 dollars per fill up x 52 weeks ( I have to fill up everyweek as this is my DD) for an extra 5 HP? Not to me. So I am looking for a realistic idea of what I could get between the 3 diffrent octanes...
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2011 Coupe - 3.7 Premium - BAMA tune, AirRaid CAI, GT500 spoiler, staggered AMR 20's, BMR PHB & LCAs. Eibach springs, and sways, Raxiom Navi, Roush axlebacks, BBK headers
If its not worth it to you, don't do it. I doubt you would get 5 hp by switching from 87-89, maybe from 87-91 with a good tune. I don't know though. If it is a dd, to me I would do 87 or 89, I remember awhile ago there was a thread about fuel mileage and a few guys said they get better mileage on average with 89 over 87. Maybe see if there is a difference in mileage for you over the course of a few fill ups and average it out, if there is I would pick that octane. Just my .02
So true Shaun, I see a big difference in running cheap 87 to good 87, let alone 89 or 91 from Chevron, Shell, etc... OP, you will probably get the same mileage or better with 91 octane, your car will run smoother and better acceleration which means less pedal to move the car. You should go with 89 from the "sound" of your text, not that much more than 87 and will run cleaner.
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91 is the only way to go. you dont want to sometimes fill up with premium then sometimes with regular. its not that much more but so much worth the gain
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