Well to cut this short, my dad's PA-28-140 Cherokee has a STC to allow it to run on autogas. 100LL is hovering on $5.53/gal, so there is NO way I'm dumping that crud into the tanks. I'm going flying this weekend. I'm wondering wether I should pay $3.35/gal and get E10, or pay $3.65+ for pure unleaded. Keep in mind this plane has two wing tanks, of 27-ish gallons each, so filling it will be over $250. I'm worrying about the long-term harshness of the ethanol on my fuel lines zigzagging through the wings and ****pit, etc. Def don't want to be replacing those next annual. I'm also wondering on how this will affect the engine. It is a O-320A low compression, wide flange model. I'm wondering what ethanol will do to carbon buildup on the mags, exhaust temps, and so on. Thoughts?

 

Raptor, check out this EAA wesite. Stick with the non ethanol.

http://www.eaa.org/news/2006/2006-11-01_faa.asp

 

what does the STC say about ethonol? There should be plenty of info on it.. the FAA is ridiculous with regs. I wouldn't use it if I were you. If you fly in colder weather you may find freezing problems as ethanol is hygroscopic. I know you purge your tanks of water before every flight... but still.. I wouldn't take the chance. Your talking about $15 difference on a fill up.. I wouldn't sweat it.

 

+1

X2

 

its your DADS plane. if you screw it up im sure he will kill you. spend the extra money.

 

Not only should you not put E10 in it, you should have a test kit to make sure the supposed pure gas really is pure gas. Alcohol in avgas is bad news.

 

I've had my plane for the last 10 years and it also has the STC for auto fuel. I've never run it and unless it's an emergency, I never will. Like it was said, only another $15 per fill up for the 100LL. My planes a 1960 Cessna 175 with the GO 300 six cyl. Continental engine.