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Old 01-02-2013, 08:23 AM   #14
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Originally Posted by Slo86GT View Post
When 87 octane was touching the $4.25/gal here 9 months ago or so, I noticed that the E85 was FAR behind on the price hikes, and didn't go over $3/gal, making the 30% less efficiency trade off pretty much moot.

Right now the E85 and 87 octane are similarly priced, which makes NO sense to run the E85 on, but in the future, I will probably be setting up my '86 Mustang's new engine for E85. It runs cleaner than 93 octane, and you can run around 5 degrees more timing to take advantage of the knock-resistance. The only upgrade required to run the E85 is 30% larger injectors and a twist of the distributor. Voila. Enjoy your extra low end torque.

Has anyone done 87 vs 93 vs E85 dyno testing with the FlexFuel Focii? I'd love to see if the ECU takes advantage of the 12:1 compression on E85 like it SHOULD be able to.
Around here E85 has always cost within about $0.20/ gal of E10 87 octane, which means its not worth the added cost. Maybe if it was at least 30% less expensive than E10 87 octane it might almost pay for itself, but that does not happen around here.

If the car is maxing out on E10 93 octane E85 won't be of any benefit.

Originally Posted by Just Tom View Post
How long before you guys began seeing a noticable increase in mileage? The best I can muster is 28MPG from my car, which by the way has about 2,700 miles on the odometer.
I'm not so sure, since my car had gotten 30+ mpg from the first tank. The lowest numbers I've seen were in town but I don't think I've ever had a tank below 29 mpg yet. Car has 808x miles on it as of now.
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