The FAA offers many useful publications for the aviation community, but some of them are little known and seldom read. The use of automotive gasoline as a substitute for avgas can cause corrosion, sticking valves, and exhaust valve failure. The octane rating specified by the engine manufacturer is the minimum grade of fuel to be used for a given engine. Avgas of a higher octane rating may be used safely. The most common problem with the use of higher-octane fuel is a. detonation.
Water is the most common fuel contaminant.
Do not top off the tanks so that the fuel has room to expand. Use proper leaning technique in flight. Fuel filler caps are incorrectly installed. Any of the above. To clean, cool, lubricate, and seal b.