Ethanol free gas

[arredondosha]

So after reading another post about gas mileage. My question is would 87 octane ethanol free be worth the 25 cent premium to regular 87 octane with 10%ethenol. Right now gas is about 2.40 a gallon and the ethenol free is 2.65. But as we all know gas prices are going up again.

What are the main advantages of ethenol free more power?

 

[OUsig]

My short answer - no especially if that ethanol free gas is not of the "top tier" variety and I will guess it is not.

Any modern vehicle is fine with the 10% stuff and I have not noticed much if any gas mileage increase when I tried it for a few tanks before.

 

[BARRYW]

Your gas mileage would in theory go up 10 percent. Do the math and see if it works for you.

 

[OUsig]

To answer your last question
Technically there is more available combustable energy in 100% gas. At least that is what I believe is correct, if a chemical engineer sees this post they can clarify! 😎 BUT modern cars are tuned for the 10% and rarely see a benefit
Now if you have a car from the 1990s or before, then the 100% gas may be of benefit for power and better for the fuel system overall.

 

[EdP]

To answer your last question
Technically there is more available combustable energy in 100% gas. At least that is what I believe is correct, if a chemical engineer sees this post they can clarify! �� BUT modern cars are tuned for the 10% and rarely see a benefit

From what I'e read you should get about 3% better mileage. A 25 mpg trip would be 25.75 mpg. One a 500 mile trip you save a bit over a half gallon or maybe $1.25 on an otherwise $62 fuel bill. Not worth considering.

 

[Mark_888]

Now if you have a car from the 1990s or before, then the 100% gas may be of benefit for power and better for the fuel system overall.

Yea, "benefit." Like the engine actually keep running past 50K miles.