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Use 91-93 if you want the car to run as designed
Posted by Greg Netzner (more from Greg Netzner) on Sun, 19 Jan 2003 20:44:32
In Reply to: 89oct Vs 93oct, Dr. Max, Sun, 19 Jan 2003 12:08:58
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Yes, you can use 89, but an occasional tank of 93 won't do any cleaning. (If anything, I'd think it'd confuse the computer as it tries to adjust from 89 to 93 & then back to 89 again.) If you want clean, dump a can of BG 44K into the gas tank. Use it every 30k miles.
As far as mpg, I've got some old data (maybe 10yrs?) which says the higher octane gives better gas mileage on our Saab turbos. I guess it depends on how you drive. Hot-rod it with 93 & your mileage WILL go down.
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