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Topic Review (Newest First)
Today 09:18 AM
Tigeo I am really turning around on this topic. In the summer months, above 90 deg, a/c on taking off from a stop, I believe running premium makes a notable improvement. On the highway, not so much. In the winter, not so much. I think the mpg argument is still crap at least based on my data, but in terms of drivability, I'm becoming a believer.
04-13-2017 05:13 PM
Drovira14 Side note: I average about 22-23 mpg city/highway with premium (heavy foot)
04-13-2017 05:11 PM
Drovira14
Premi gang

Quote:
Originally Posted by sonic blue 12 View Post
yes or not worth it
I don't think you would notice a difference if your car is stock but again I am clearly no expert! I have been running premium for about two weeks. With the mods I have (nothing crazy see my profile) I noticed a slight difference in noise and lightly more down force on your butt dyno. In high gears the car seemed to have more pull. I would recommend it if you have upgrades. I am tuning after I pick my SCT Tuner back East for Easter (Watch Out!)

I have noticed that it really comes down to you as the driver and how you want your car to be.
04-05-2017 08:22 AM
novus As long as you're not in stop & go traffic (think NYC/Long Island Borough), you'll be fine. Not to mention, I manually shift the thing since the day I got it and I don't have any issues.

I will get the occasional Neutral rev hang up but that's about it. But that's as simple as throwing it in N and then S real quick.
04-05-2017 05:52 AM
Miked1964 Ford did replace the clutch in my 2015 Ford Focus and I use nothing but premium gas. Car runs incredible now. There are still a few quirks now and then with the tranny but you have to remember this is a manual transmission in reality. Open highway I get around 38-40 mpg at 65 MPH. This is really a nice car. It's unfortunate that these transmission problems are bringing the value down.
04-05-2017 12:33 AM
novus
Quote:
Originally Posted by suss6052 View Post
E85 is not cheap racing fuel. Pump E85 is not that good, and unless the station does a lot of turn around (sales volume of E85) it degrades in the fuel tanks of the gas station due to it being hydroscopic and attracting water vapor into the fuel.

E85 if using sub octane fuel is still around the same octane rating as premium fuel with much less energy content per gallon than E10 premium. Hence the poor fuel economy and only incremental gains in performance.

Plus even the FFV models can't really take advantage of the benefits of E85 as they do not significantly alter the ignition timing to take advantage of the latent heat of vaporization of the Ethanol.

Lol.
From my understanding, Cali goes through E85 like crazy.
04-04-2017 10:55 PM
suss6052
Quote:
Originally Posted by SlowhiteJr View Post
E85 is always better. E85 is the cheap man racing fuel. Regular to premium is about $3 a tank. It's not really that big of a difference
E85 is not cheap racing fuel. Pump E85 is not that good, and unless the station does a lot of turn around (sales volume of E85) it degrades in the fuel tanks of the gas station due to it being hydroscopic and attracting water vapor into the fuel.

E85 if using sub octane fuel is still around the same octane rating as premium fuel with much less energy content per gallon than E10 premium. Hence the poor fuel economy and only incremental gains in performance.

Plus even the FFV models can't really take advantage of the benefits of E85 as they do not significantly alter the ignition timing to take advantage of the latent heat of vaporization of the Ethanol.

Lol.
04-04-2017 10:46 PM
SlowhiteJr E85 is always better. E85 is the cheap man racing fuel. Regular to premium is about $3 a tank. It's not really that big of a difference
04-04-2017 10:39 PM
Jburks dang, i get 25mpg with premium 92 octane lol.
04-04-2017 10:20 PM
okvol Let me muddy the waters. I've tried E-10 92 octane, and it does run better. But my best performance is with E-85. My mileage drops to around 25MPG. But I autocross this car, stock engine, AEM filter. And the grunt off the corners is improved, and she keeps pulling all the way to the limiter.
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