What do you consider; "The price is acceptable". Almost every report has shown that any combination of gasoline that included ethanol, gets lower gasoline mileage. Some reports show a dramatic difference. If you were running a majority of ethanot, like E85, then the "Possible" ecological advantages "Might" outway the cost difference. But, if some of the reports are correct about getting between 10-25% less gas mileage, then you have to look at what you are truly saving by using E25. Not counting the possible harm to the car.

I.E. You car gets 20 mpg on regular 91 octane gas. Costs $3.50 a gallon. E25 costs $2.65 a gallon, BUT you only get 15 mpg using it. On a full 18 gallon tank, you go from 360 miles to 270 mies. Now, you need 8 more gallons of E25 to make up the 90 miles you lost. That's an additional $21.20 at $2.65 a gallon. Percentages are NOT ALWAYS LINEAR.

So:
91 octane cost you $3.50 times 18 gallons = $63.00
E25 Ethan cost you $2.63 times 18 gallons = $47.25 (25% cheaper than gas)

If ethanol gets 25% less MPG, than instead of 20mpg you get 15mpg.
So:
91 octane gets you 360 miles; E25 gets you 270 miles. Need 8 more gallons of E25 to make up the lost 90 miles. $2.63 times 8 gallons = $21.04

ADD $47.25 for ethanol plus $21.04 for additional needed, = $68.29

So, it costs you $5.29 MORE to drive the same distance.

Of course, if the difference in gas prices isn't as great as 25%, then it will cost you more. If your mileage difference between gas and ethanot mix is less or more, that too will affect it. I am just saying that after you decide to try ethanol, that you figure out if it's really a good choice or not.

I have E10 available here. It's real simple for me. E10 and regular 87 octane (85 octane available for high altitude), is exactly the same price. BUT, going to the supermarkets and mini mart places allow a discount of $0.03 to $0.05 a gallon with their card. So we will assume that E10 is $0.05 cheaper than normal gas. My cars get about 5-10% less gas mileage with E10. I will give the benefit of the doubt and say just 5%. So, my wife's car which normally gets 30mpg get's 28.5mpg with E10. 18 gallons at a $0.05 cheaper is a $0.90 savings. But, I lose 27 miles on a full take of gas 30mpg vs 28.5mpg. So, I need an additonal ALMOST 1 gallon of E10 gas to get me that 27 miles I lost. So, the $0.90 I saved buying the E10 instead of regular gas cost me an additional $3.19 for a gallon of gas. Net change; $-2.21. It COST me $2.21 to save $0.90. These are real numbers. Your numbers may vary. Later... Mike....