E-85 is 15% gasoline 85% alcohol.

The "new" crap they're going to foist on us is E-15, 85% gasoline 15% ethanol.

 

I switch back and forth in my 08 5.4FFV depending on price.

You just want to run the tank low before switching so the ecu adjusts easier instead of blending the different fuel types.

And for information sake E85 is anywhere between 70-85% ethanol based on the batching.

 

Postal has it right. Shouldn't hurt to switch between the two if you truck is meant to run it.

 

Thanks for setting that straight. I corrected my post.

This new stuff is going to create a problem for the marine engines as well, as they cannot run with ethanol, and many folks with boats are afraid they will not be able to get "regular" gas in the future, except at marina's where it will be real expensive.

 

Here's it good site for finding pure gas. The marine folks are big about using ethanol free gas when possible.
http://pure-gas.org/

 

I don't see how ethanol burns hotter than regular gas throw each on a fire and see what happens the ethanol is about like pissing on it but the gas flames up, look at your tail pipe at how much more moistiure comes out with ethanol blended fuel than with regular gas, I can't see how it's not hurting your engine with that much water coming out the tail pipe, maybe that's why the cats are going bad so often? And plugs sticking in the blocks and breaking off?

 

Ethanol burns cooler than gasoline-yes. The "hot" issue has to due with the air fuel ratio being incorrect (lean condition mentioned earlier) as well as some other issues, and can cause engine damage. The fuel/air delivery system needs to be designed/calibrated to recognize what fuel it's working with. I don't know if a custom tuner would be able to help with the situation or not. Kind of a moot point, as the fuel lines and fittings also can be damaged by ethanol if not designed for use of same.

 

I have an 08 fx4 with the 5.4 and it runs like crap when I use it, runs lot better with regular gas and I get about 2 more mpg with regular gas,ethanol already screwed up my boat motor and lawn mower

 

here in ethanol country i and the almost everyone I know runs e10 in almost everything. I personally run e10 in my riding mower, push mower, oil/gas mixed weed wacker and chainsaw. My 04 150 screw averages 16.5 on the stuff and my wife's 08 Chevy HHR averages 30+ on it too. obviously the stuff works or it wouldnt be all over the country. and there isnt a single gas station in my area that doesnt have the stuff.

I think the biggest thing is, Run what you run and dont switch back and forth all the time. The computer learns what you put in it and adjusts the computer to run the best. I have always ran e10 from the same station every time i fill up and the only time it gets anything any different is if im on a trip. which in this economy doesnt happen very often.

 

also, there was an article in our local paper a while back that stated something like e10 in our area usually contains about 5-8% ethanol. they did find a local station that had only 2% average over the month that did the testing.