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Unread 08-15-2014, 07:21 AM   #1
rdf
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Default Has Anybody seen this - Fuel Selection App

I think there's a lot of confusion at the gas pump, especially on the multi-grade pumps with 4-5 different grades at vastly different prices.

Do any of you know when it makes sense to buy the cheaper blends and not actually have them cost you more than what you lose in mileage?

A pump near me has two 87 octane grades (one with 10% E), a premium grade, E-15, E-30 & E-85.

With a flex-fuel vehicle how do you sort this out (while standing at the pump) on all the different grades and prices?

I just stumbled on this - Has anybody seen what these guys have built?

www.fuelcog.com

Has anybody used it?

Last edited by rdf; 08-15-2014 at 07:27 AM.

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Unread 08-15-2014, 08:35 AM   #2
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I wouldn't use a lower grade octane than your manufacturer recommends. What those guys on fuel cog are saying isn't unheard of, it really depends on what car you have though. There are some that benefit and get greater mileage, enough to make it worth it, with higher octane fuels and there are some that don't.

I'd just try it and find out. Keep track of your mileage and test a couple different grades.
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Unread 08-15-2014, 09:36 AM   #3
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475 ...have you seen this?

Gas Mileage of Flex-Fuel (E85) Vehicles

Pretty much a straight line on energy content from what I'm told -

What do you think?

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Unread 08-15-2014, 05:05 PM   #4
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Trying to understand your question.

i think the fuelcog thing is completely whack, there is NOT that much difference, modern fuels are very unlikely to be noticeably different.

as far as E85, yeah it pretty much shoots fuel mileage and IMO is pretty worthless.
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Unread 08-18-2014, 10:06 AM   #5
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Quote:
Originally Posted by Mike View Post
Trying to understand your question.

i think the fuelcog thing is completely whack, there is NOT that much difference, modern fuels are very unlikely to be noticeably different.

as far as E85, yeah it pretty much shoots fuel mileage and IMO is pretty worthless.
I respectfully don't understand your statement, Mike. You say there is not that much difference in "modern fuels"...then go on to say E-85 is worthless. Is not E-85 considered a "modern fuel"? From what I think I'm finding out there is a "mileage-penalty" to all the ethanol blends -compared to E-0 grades, mostly proportional to the % of ethanol blended.

Have you seen this site?

Gas Mileage of Flex-Fuel (E85) Vehicles

The "mileage-penalty" on all of these vehicles at this site are almost always directly proportional to the decrease in the energy-density of E-85 (28% lower energy density).

Would I be mistaken to assume this relationship holds true on other E-grades, proportional to their respective decreases in energy densities - when compared to the E-0 grades?

Please let me know what you think. I would appreciate your thoughts.

Last edited by rdf; 08-18-2014 at 10:09 AM.

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Unread 08-18-2014, 05:58 PM   #6
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Quote:
Originally Posted by rdf View Post
I respectfully don't understand your statement, Mike. You say there is not that much difference in "modern fuels"...then go on to say E-85 is worthless. Is not E-85 considered a "modern fuel"? From what I think I'm finding out there is a "mileage-penalty" to all the ethanol blends -compared to E-0 grades, mostly proportional to the % of ethanol blended.

Have you seen this site?

Gas Mileage of Flex-Fuel (E85) Vehicles

The "mileage-penalty" on all of these vehicles at this site are almost always directly proportional to the decrease in the energy-density of E-85 (28% lower energy density).

Would I be mistaken to assume this relationship holds true on other E-grades, proportional to their respective decreases in energy densities - when compared to the E-0 grades?

Please let me know what you think. I would appreciate your thoughts.
No, I meant there is no difference between Holiday gas and BP gas, as the link suggests. E85 and different octane levels yes, but different stations, no.
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