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would it make sense that I am seeing 5-7 better MPG with 100octane vs. 91...i drive pretty much the

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Old 04-01-2005, 06:50 AM
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Default would it make sense that I am seeing 5-7 better MPG with 100octane vs. 91...i drive pretty much the
same on both - as in quite a bit of WOT, but the 91 software is reading on the computer with substantially worse gas mileage...don't think that it's enough of a difference to balance out the price of the 100 for everyday driving, but was wondering if anyone else experiences anything similar...or is it just something flakey with switching ECU's or software or something.
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Old 04-01-2005, 07:16 AM
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I thought in general lower octane gases should give better mileage???
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Old 04-01-2005, 07:38 AM
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in general you'll get better mileage out of higher octane, but not that much better.
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Old 04-01-2005, 08:54 AM
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Default probably something with the software
My average reads 17.5mpg, running 93 or 100, even if I reset it before each tank. I never tried 91, except maybe in rental cars and trucks
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Old 04-01-2005, 08:56 AM
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Maybe the 91 ECU is programmed to run richer.
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Old 04-01-2005, 09:11 AM
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i thought higher mpg because burns slower but hotter?
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Old 04-01-2005, 09:23 AM
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How is your car ? Fixed ?
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Old 04-01-2005, 10:00 AM
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Default race gas in general has more hydrocarbon content per volume than pump gas
91 in the summer in California gets about ~21%fillers
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Old 04-01-2005, 11:41 AM
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cuz you don't have to gas it as much to go faster - beauty of 100 oct more hp no other changes
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