E15 fuel
 

Federal government will permit year round same of E15 fuel (15% ethanol).

Is this a problem for cars - how about older cars, specifically 1989 911s?

Corrosion of fuel systems.

If you can't get E0 you might want to have your fuel system redone.

I can get 87 octane E0 which is what I use in my 944.

Not sure what to do with the Z06 as I believe it benefits from higher octane fuel.

Fuel fires/spills are not fun.

It should run just fine, but, water content, and corrosion will be issues.

Just read that use of E15 in some newer vehicles will void the warranty. Just bought a new Honda
last year. Guess I better check the warranty. Only use E0 93 in the Porsche's and a truck. Easy to find E0 89. May use that in the Honda. That's what I use in the yard equipment. Hate ethanol.

Lots of cars will not like E15. It bet in 20 years or less there will be a class action suit and many new reports of families burned up in car fires from E-15 running in the typical old beater family hauler that only sees a mechanic when it stops running.

I am lucky, I have lots of E-0 sources of gas. It costs more, but it is all I use.

Sounds good. I wish we could get more ethanol in our gas. 94 octane (E10) locally was 157.9/L last time I filled up the turbo car. The engine going in my P-car loves ethanol. :)

My understanding is that the motors themselves will be just fine, actually, in some ways better than with straight gas. It's primarily the fuel lines, especially the rubber portion, that suffer the most. For an '89 911, I would think if you haven't already, you may want to replace the rubber lines.

I had a 951 that burned to a crisp thanks to that ethanol junk eating the fuel lines from the inside out. Not a fan.

It appears that the change is to allow E15 all year instead of just spring, fall and winter, not to require it.

I can't recall seeing E15 for sale - just the ubiquitous E10.

I'm not seeing where E15 will be mandated.

I do not think its a problem in a car that is driven. When it just sits the alky draws moisture. That can be a problem. The car would have to be really old for the 15% to hurt the rubber. I ran E85 in my 87 Corvette for 3 years and the rubber lines at the tank were original. No problem.

It is a problem in any car with rubber fuel hose vulnerable to ethanol in some part of fuel system, so pretty much all cars.

And not just the lines but any seal, so pump, rails, joints, injectors...

I had the same with a 944S.

at one point I had thought e15 was actually 85% ethanol. guess I was wrong in that?

Feels like a payoff to the farm lobby.

Now that would be E85 which is available and apparently is the hot ticket for super high HP cars. Nothing that I drive. E for ethanol ain't that hard to remember.
I've tried 100% gas vs E10 mix and never could determine a difference in seat of the pants feel or gas mileage. Like others have said, E15 isn't sold in NC at this time (that I've seen) so not an issue.

Another issue with E10/E15/E85 and older cars is that ethanol is quite a solvent. When E10 first hit the market, me and several friends had to replace carburetors on small engines as it dissolved and pushed varnish into the carb. Then as the implements sat unused over the winter, the ethanol evaporated and left the varnish in it's new home.

Exactly. It has also driven up the price of all groceries as farmers have planted more corn to meet the "demand" of the E10 blends. All so we have a fuel that gives cars worse MPG, that makes total sense.....

Most modern cars have statements in the manuals that use of over 10% ethanol gas is prohibited, so it's a legitimate warranty issue.

Don't use your butt, use your brain to tell the gas mileage difference. Divide the miles driven by how many gallons. Simple math for brains, really hard for butts to figure out.

I have had to use E10- in states where that is all that the only choice. I can tell in my 911 the gas mileage difference with shorted distance before a fill up.

You will never notice the performance difference unless you are running really hard and have knock sensors that retard timing. Octane does not add any power but it allows for higher compression. So unless your turbo or supercharged car is tuned for it, it is pointless.

I've recorded gas stats since the day I bought the car 10 years and 100 k miles ago so I know my mileage. A few times over the years I found pure gas and bought a few consecutive tank fulls and I've never found a difference in mileage or butt dyno feel. Can generally only find E10 in NC, pure gas is a Snipe hunt mostly. Shouldn't argue that it should be noticeable as I am an engineer, simply that at least in my car other variables must make it invisible.
Edit: Yes, that comment below is definitely true. The pump says max or ( up to ) 10% so no idea how much is in any tank I guess ? Kind of a weird call out for a fuel seems like but we're all used to it now.

Something to consider is that it is up to 10%.

I'm not sure what is really going in.