FAAST Topic of the Quarter. Carburetor Icing and vapor lock are more likely with MOGAS than AVGAS  Carburetor Icing and vapor lock are more likely with MOGAS than AVGAS.  The presentation focuses on a Sport Cruiser accident that occurred in Addison Texas. Rotax now recommends a Fuel Return Line. Good information is provided for anyone using Automotive Fuel in their airplane.  We ll take a brief look at fuel system design, engine cowling design, fuel quality, seasonal adjustment of fuel, and high ambient temperatures. 30 minute webinar. Awards WINGS  1/2 credit basic knowledge topic 3 or 1/2 hour AMT Credit.