Last week flying an aircraft with an accurate carburettor temperature gauge in the cold weather I was interested to note that while using Mogas, even with full carb heat selected, the carb temp would not rise above the 'yellow' zone where icing is possible... When I switched to Avgas the temperature in the carburettor rose by approx 10 Deg C as the Avgas flow took over; now the temp could easily be brought above +5 deg C... apparently it was taking more heat to vaprorise the Mogas....
There are definitely issues to be taken into account when running an aircraft engine on Mogas - even if it is designed to do so. Subtle symptoms due to the factors associated with MOgas are often not noticable to the GA pilot. There are those that say 5% ethanol will not affect performance; I don't know, but I would be prepared to bet it certainly won't improve matters!
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