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Have you actually measured an increase in mileage with 91-octane? You need to run the tank almost dry and have someone else fill the tank. Then, see if you can tell what gas they put there.
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Bruce in Houston
2007 Mazda MX-5 Touring
2002 Dodge Dakota QC tow beast, stock!
1998 Suzuki Bandit 1200S w/ $tuff
1994 Nissan Sentra SE-R w/ $tuff converting to ITA
1990 Acura Legend LS sedan leaving the stable
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