I have a question for the experts on this.
If I am sat at an airfield with 30L of mogas in my tank and it is a hot day. Say a fuel temp of 30c. I refuel from an underground tank with 40L of avgas. I assume the avgas will be coming out of the ground at about 10c? The fuel temp should then be within minimum and the mix of avgas/mogas will presumably be a lower risk than pure mogas?
Is there any data on the performance of avgas/mogas mix, and is this a half way house as far as risk is concerned?
I would assume that most people who run aircraft on mogas with only one tank would actually be running on mix.
Rod