Hello Humberto:

See the Experimental Aircraft Association's website for details regarding the auto fuel STC for the C-182L. They are at http://www.eaa.org/education/fuel/index.html

You can also check the Petersen Aviation Inc. site at http://www.webworksltd.com/

These sites are very informative, and should address all of your questions.

Good luck.

Randy

Try looking at this STC SA01944CH (1 OF 2)

This is by the EAA

Humberto:

My 1956 172 came with peterson's autofuel STC and I run premium unleaded regularly. I have much less problems with leading if I use it at least half the time.  I've been up to 10,500 in the summer on more than one occasion and have never had a problem. I do switch to one tank or the other above 5,000 but Cessna's like mine have placards for that regardless of the fuel used to prevent vapor lock.

I do switch to just avgas if I'm going to let the plane set for any length of time since autufuel isn't nearly as stable and I'm very careful about which stations I buy my autogas from. I also use a strainer when putting in autogas but haven't seen any sediment when I buy from a station that sells a lot of fuel (switches the fuel in their tanks frequently). 

I worked in Mexico in the early 80's (long time ago) and the autogas they sold at the time in the area I worked wasn't very good compared to the fuel I bought in America.  That may have changed but be careful. Also, I've seen several articles and warnings against puttin any fuel that has alchol added. Its hard to buy non-oxygenated fuel (alcohol added) in some parts of the US but when in doubt, I put in avgas. 

I wouldn't hesitate to get the STC and use premium unleaded as long as you follow the requirements in the STC. Just be careful where you buy the fuel from.

Gary

What is recommendation for use of ethanolized autogas in C150G.  I have the EAA STC.

The battery voltage on your airplane had nothing to do with the Auto gas STC.

I used to use auto gas in my C150 and had no problems... Since almost all of the auto fuel now contains ethanol it cannot be used in certificated airplanes even if you have the auto gas STC.

Ethanol will absorb moisture, corrode the aluminum fuel tank and fuel lines. Ethanol had about 25% less energy per gallon than does gasoline. This means less power unless you enlarge the main jet and less range. Did I say that the ethanol will soften and damage some O rings and gaskets in the fuel system....

I am jealous of your source for ethanol free mogas. I can't seem to find it here (MI) anymore.  I have a 172 with O320-E2D with powerflow pipe.  Mogas was the best when I could get it.  I used mogas almost exclusively for over 300 hours.  I had no trouble whatsoever.  In  addition, your spark plugs will last almost forever. Inspection of the bores, valves,etc shows no deposits at all. Your oil will stay cleaner longer, too.  The powerflow pipe was the most satisfying modification of all..more hp, shorter ground roll, better climb!
  One serious warning:  because mogas is used almost immediately after production, it has no stabilizers blended in and will go raunchy fairly quickly (think of your lawnmower, snowblower, etc after sitting for a while.)  If you use the mogas promptly you should have no problems.  If your plane will sit for long periods make sure you keep some avgas in the tanks with it. Avgas seems stable for years, based on inspection of some of our "hangar queens" that sit for that long.