Mogas
I can give you two cases where mogas is a no-no. A few years ago at our local airport, a couple guys where killed because of mogas. The two where delivering a second plane for annual on a hot day in July. They arrived dropped off plane, sat on ground for a half hour in a Cessna 177. Started engine, taxied to runway.
When they where about 200 feet off ground, engine quit. They tried tunning back to runway and crashed, killing both. NTSB found auto gas that vaporized in gas line and carborator.
The second case less than a year later. A guy in a J-3 Piper Cub on take off just a few feet off runway. His engine also quit because of vapor lock. Also hot day and using auto gas. Managed to make a safe landing. Remember auto gas was formulated for water cooled engines that get no hotter than 220 degree. Aircraft engines that are air cooled run much hotter. Most aircraft engines run in the 400-500 degree area . Auto gas boils at a much lower tempature than av-gas. Unless you live in Alaska I would not even concider it.
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