[727pilot@usa.co]

Let me weigh in on the Avgas discussion.

A few years ago Shell wanted to stop making 80 octane avgas. They, without the benefit of any research, talked the FAA into believing that their "100 octane Low Lead" product was safe to use in engines requiring 80.

Today you can not buy much anything BUT 100 Octane Low Lead.

Here is the interesting part. That fuel has 3.5 grams of lead per gallon! I mean calling it "Low Lead" is kind of like calling my wife's dishwasher "Controlled Sound". (Yeah, it's printed right on the front of it and it sounds only a little less loud than a 727 taxiing through the kitchen.)

Since that time there have been numerous Airworthiness Directives that involve pulling cylinders off Lycoming Engines, Changing valves, replacing cam shafts and who knows what else.

Bottom Line - save the five bucks a gallon. There are a whole lot better ways to get the octane you need.