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Old 05-20-2008, 09:21 AM   #16
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There are numerous tunes you can get. I would probably divide the tunes into 2 catagories: 1) fuel efficiency and 2) high HP. Most of the guys on here are probably running the high HP tune which isn't going to be the best mpg. With that said, I am tuned on the pig rich side, especially at WOT, and I am seeing anywhere from 9-11 mpg.

Typical 2008 flex-fuel cars from the factory are seeing around 18 city/28 highway mpg on gas, and 13 city/ 20 highway mpg on E85. But again, you have the issue that these cars are running the same "tunes" for both types of fuel. If there was a switch that changed the tune to increase the timing and lean the fuel on the top end whenever E85 is being used, the flex fuel cars would probably see similar mpg ratings.
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Old 05-20-2008, 09:46 AM   #17
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Quote:
Originally Posted by psychdaddy View Post
There are numerous tunes you can get. I would probably divide the tunes into 2 catagories: 1) fuel efficiency and 2) high HP. Most of the guys on here are probably running the high HP tune which isn't going to be the best mpg. With that said, I am tuned on the pig rich side, especially at WOT, and I am seeing anywhere from 9-11 mpg.

Typical 2008 flex-fuel cars from the factory are seeing around 18 city/28 highway mpg on gas, and 13 city/ 20 highway mpg on E85. But again, you have the issue that these cars are running the same "tunes" for both types of fuel. If there was a switch that changed the tune to increase the timing and lean the fuel on the top end whenever E85 is being used, the flex fuel cars would probably see similar mpg ratings.
I thought that the newer flex fuel cars had a sensor to know when they are using E85 and then "switched" tunes? I am very curious to know on the average car, with the proper tune, how it would all play out..
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Old 05-20-2008, 09:48 AM   #18
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I thought that the newer flex fuel cars had a sensor to know when they are using E85 and then "switched" tunes? I am very curious to know on the average car, with the proper tune, how it would all play out..
Maybe they do, I am not sure as I don't own one. Someone on here probably has a flex fuel vehicle and they can comment. With that being said, I still believe the factory would only increase the timing and A/F curves by a modest amount.
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Old 05-22-2008, 02:39 PM   #19
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So what is the difference in octane rating for the different blends?
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Old 05-24-2008, 04:38 PM   #20
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On average, E85 is supposed to be between 100-105 octane.

Found a good site for tuning and determining the blends:

http://www.e85mustangs.com/regions123.html
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Old 06-14-2008, 05:11 PM   #21
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Filled up with E85 today at 37th & Woodlawn for $3.40 gal. 7.3 gallons for $25.00.

Drove by Shell on Pawnee on the way home & E85 is $3.65 gal.
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Old 06-22-2008, 05:42 PM   #22
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Filled up with E85 Saturday at 37th & Woodlawn for $3.49 gal.
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Old 06-22-2008, 11:34 PM   #23
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filled up today at pawnee and hydraulic for 3.72
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Old 06-22-2008, 11:36 PM   #24
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Wow. That's making it somewhat not worth it, correct?

I mean you're still going to have higher-octane fuel, but it burns faster than regular unleaded. Is the cost beginning to outweigh the benefit?
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Old 06-22-2008, 11:49 PM   #25
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Wow. That's making it somewhat not worth it, correct?

I mean you're still going to have higher-octane fuel, but it burns faster than regular unleaded. Is the cost beginning to outweigh the benefit?
It's prob. going up because corn is "gold" right now.
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Old 06-23-2008, 08:52 AM   #26
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Quote:
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filled up today at pawnee and hydraulic for 3.72
They aren't passing the savings on to customers, therefore I will not give them my service unless I am absolutely close to empty or just need a little to fill the tank. I made a point to go into the Phillips station at 37th & Woodlawn and asked for the manager. I told them that it is really appreciated how they are holding their E85 prices down and passing the savings on to the consumer unlike others who are selling E85 in ICT.

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Wow. That's making it somewhat not worth it, correct?

I mean you're still going to have higher-octane fuel, but it burns faster than regular unleaded. Is the cost beginning to outweigh the benefit?
I think it depends on what your goal is. Yes the price is approaching the 87 octane price, but you are still getting close to 105 octane. Yes you are consuming close to 25-35% more at WOT than straight petro, but cruise and idle are more like 10-15%. If a person is strictly considering the switch to E85 based on cost per MPG alone, I would not recommend the switch. If you factor in the cooler burn, lower price (at this time), higher and more consistent octane rating, eco friendly emissions, etc., then E85 probably outweighs regular petro.

Couple of hypothetical scenarios:

E85

15 gal tank X $3.72 gal @ 105 octane = $55.80 + 35% (WOT worst case) = $75.33 per tank cost (per X number of miles) assuming a lot of WOT driving. Plus you have a pretty consistent 105 octane rating.

Petro + Race Fuel

same 15 gal tank = 10 gal X $4.09 gal @ 91 octane = $40.90 + 5 gal X $7.50 gal @ 110 octane = $78.40 per tank cost (per X number of miles). **This does not acct for any degradation as result of WOT driving which would make the total cost per tank even higher** You are also "hoping" that your octane rating is close to 98 with this mixture. If you wanted 105 octane, similar to E85, you would need close to 11 gal of 110 ($82) + 4 gal of 91 ($16.36) = $98. Again, no degradation accounted for WOT driving.

You mathematicians on the board can play with these numbers as I did this off the top of the dome, but I think you get the picture. Although they are close in price, there are benefits to running E85 that you do not get with with race gas + 91 octane.
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Old 07-04-2008, 02:46 PM   #27
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Filled up with E85 today at 37th & Woodlawn for $3.42 gal.
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Old 07-07-2008, 10:34 PM   #28
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Quote:
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Filled up with E85 today at 37th & Woodlawn for $3.42 gal.
That's where I have been getting and will continue to get mine. I filled up today for the same $3.42/gallon. I even drive up from the south end of town to get my E85 at 37th and Woodlawn.
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Old 07-09-2008, 10:10 PM   #29
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Stopped at Shell on Pawnee to top the tank this evening and guess what???? There is now a .20 delta between Regular and E85. That's better than the .10 delta they were holding steady at.

E85 was $3.59 gal and Regular was $3.79 gal. Another dime and they will be competing with Phillips.
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Old 07-13-2008, 01:14 AM   #30
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Filled up tonight at the Shell on Pawnee and it was $3.46/gal for E85.
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