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Old 12-17-2014, 01:42 PM   #1581
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I'm comparing it it to the 32 to 36 mpg I was getting on 87. Even on the low end I am averaging 5 more miles to the gallon. And yes it makes me happy getting that much more.
So you are saying 93 octane is giving you at least a 15% increase over 87? That's impressive but I have a hard time believing that would be the case long term.

E10 87 octane up here is 2.50 per gallon. At this price, and a 15% mpg increase, the 93 octane would need to be less than 40 extra cents per gallon for me to even try the 93.
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Old 12-17-2014, 02:01 PM   #1582
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Originally Posted by aaron.b View Post
So you are saying 93 octane is giving you at least a 15% increase over 87? That's impressive but I have a hard time believing that would be the case long term.

E10 87 octane up here is 2.50 per gallon. At this price, and a 15% mpg increase, the 93 octane would need to be less than 40 extra cents per gallon for me to even try the 93.
I agree. On my recent trip there were too many uncontrolled variables (moderate to severe weather deltas within the trip) to get a good reading on 91 vs 87.

Isn't the EPA testing on the Focus non-STs done on 87 octane gasoline? I believe for the DCT those are 26mpg and 37mpg, city and highway respectively. While that doesn't mean the 2.0 GDIs don't get 10% - 15% better range with 91 octane, I would think Ford would be hammering "You get a whopping 37 mpg highway on 87 octane gasoline, but if you choose to use 91 octane gasoline you'll get a much improved 42 mpg highway."

If this is truly the case, Ford is dropping the marketing ball on a 160 SAE net hp car getting >= 40 mpg by simply failing to tell the customer to change the fuel octane.
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Old 12-17-2014, 02:06 PM   #1583
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I suspect the 93 octane he's using is ethanol free and the 87 octane contains some ethanol.
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Old 12-17-2014, 02:10 PM   #1584
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I suspect the 93 octane he's using is ethanol free and the 87 octane contains some ethanol.
Ahh, ok. Thanks for the clarification. In that case, I believe Ed Wallace, if I recall correctly always said approximately 12% decrease from same octane E0 to E10.

So 12% easily fits in the 10% to 15% delta.
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