Those stations selling a 10% blend without a posting are in violation of federal regs.
A 10% blend of oxygenate [ethanol] means the fuel actually has oxygen content. That means it has 10% less available BTU,s by volume.
The original idea had nothing to do with going green.
The intent was to make fixed fuel delivery vehicles [carbureted] operate in a leaner condition at the same throttle opening. This was proposed in the mid 80,s.
The oil companys responded by trying to alert the lawmakers that this idea would not be effective with fuel injection on the horizon.
As usual, the government decided this was a ploy and the oil companies were only trying to kill the idea because they didn't want to bear the huge expense in creating a new process added to the refining process.
It was made a requirement, and the oil companies began marketing the blend in the mid 90,s.
Our prices were adjusted accordingly. The product was initially only to be marketed in large cities that were failing to meet E.P.A. air quality standards.
So, in the Chicago area, I've been dealing with this crap for over 13 years.
What the E.P.A. isn't saying: The co-solvents required to keep the alcohol in suspension are likely more hazardous to health than straight gas.
Your fuel mileage will drop by almost the same percentage as the alcohol blend.
This occurs because the front o2 sensors see the lean condition and enrich the fuel mixture to compensate.
You will experience strange failures due to alcohol co-solvents.
The most common is fuel level senders becoming inaccurate.
The co-solvents coat the rheostat on the sender grid.
They are also likely the cause of pre-mature fuel pump failure.
Those of you who have removed spark plugs and found a green coating are looking at burned co-solvents.
If you ever remove a in tank fuel pump you will find a white coating on it and inside the entire fuel tank. More co-solvents.
Oh well, now we think we're being good to the environment by burning a renewable resource.
Well, at whos expense?
Farmers are tickled, but since were burning our crops, instead of eating them, there's less available to eat. Well if you bought groceries lately and noticed the price rise, don't blame fuel delivery expense as the only cause.
The percentage of mileage lost is slightly less with e-85 [85% ethanol] because it has a much higher R.O.N. and your ECM advances the ignition enouph to compensate, just in case you were wondering.
My own tests on the Commander running e-85 resulted in the expected mileage loss.
By calculating fuel as cost per mile though, the lower price didn't pan out, and I was spending more to travel the same distance.
In case you can't tell, I have concluded alcohol is not the answer.