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post #1 of 3 (permalink) Old 12-09-10, 06:57 AM Thread Starter
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Flex Fuel Issues??

Hello Community,

I have a '08 Grand Marquis with 27,000 miles or so. In my area E-85 is about $.70 cheaper than 87 oct. regular gas. Should I switch to E-85 and are there any problems associated with doing so? I was told that the break-even point was about $.40 a gallon differential so I could save money by using E-85.

Please discuss the issues with using E-85.


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post #2 of 3 (permalink) Old 12-09-10, 09:48 AM
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Re: Flex Fuel Issues??

Your fuel mileage will drop as much as 20%. If you use E85 only, then every 3000 miles you should use a tank of unleaded. You can add up to a half tank anytime. Check the owners manual for more information. If your vehicle is a flex fuel vehicle, you should be able to use it. There's some good information here. HowStuffWorks "E85 Ethanol Vehicles Overview"

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post #3 of 3 (permalink) Old 12-10-10, 08:18 PM
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Re: Flex Fuel Issues??

The EPA lists the GM at only 16 MPG highway with E85. That is 30% less than the 23 MPG a GM gets with gas. If you are paying $2.90 for gas in your area, a $.70 per gallon lower cost for E85 is only a savings of 24%. So actually you would be losing!


It's true that EPA mileage figures are suspect and you might do better but even with a bit more favorable figures, you wouldn't be gaining much...if any. And you would have to stop and fill your tank 30% more often.

"There is no free lunch"...

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