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Old 02-24-2002, 01:49 PM   #1
el_Presidente
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Default mixing different octane gas...good or bad?

i've gotten into the habit of putting 89 octane gas in two fillups, then on the third fillup i use 93 octane. i'm a cheap bastard and prolly not doin any good for my car, but is there any real harm in this? gas in my area has been as high as $2.80 at one point, now it's around $1.35 a gallon. let me know. thanks.
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Old 02-24-2002, 01:51 PM   #2
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Default Re: mixing different octane gas...good or bad? (el_Presidente)

i'm sorry. i'm stupid. delete this thread please.
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Old 02-24-2002, 01:52 PM   #3
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Default Re: mixing different octane gas...good or bad? (el_Presidente)

no harm unless you're having detination at lower octane fuels
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Old 02-25-2002, 02:19 PM   #4
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Default Re: mixing different octane gas...good or bad? (el_Presidente)

Your octane rating is additive and proportional to percentage of each type of fuel.

E.g., 5gal of 89 + 5gal of 93 = 10 gal of 91.

Running two loads of cheap to every one of good does nothing.
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