Mogas or avgas

The answer is yes. I use a 50/50 mogas/avgas mix in winter for better starts and a 75/25 mix in summer. You never want to let mogas go beyond 30 days without use because of evaporation of the octane additives. If I know I am not flying for 30 days or more, I fill up with avgas and run the engine.

It seems to me that this question relates very much to where you live/fly.

Climatic conditions and availability of ULP will sway the debate one way or the other.

I live in NSW Australia (spent two years in Canada, so have some inkling as to the winter conditions).

We can, on occasion, have a frost on a winter morning but then have 45C in summer.

ULP 98 RON is widely available (even on the occasional airfield) and as far as I know we don't have winterised fuel, in my part of Australia.

In about 15 years, the only time I have used AvGas, in my 912ULS, was to top up my tanks on an away trip, where the closest supply of ULP was probably a 60+ minute round trip.

I noticed no change in engine performance, just that my wallet was a lot lighter , AvGas being around 1/3 more expensive than ULP.😈

OK, this is a no brainer guys.  Avgas is a fixed RVP, Reid Vapor Pressure, that is the same summer and winter.  Auto fuels change the RVP and add very light elements to raise that number to double in the winter blends where the weather demands it in automotive applications.  You should never use winter blend fuels in summer for that very reason.  For starting however it is much better than avgas. 

Cheers

100LL is better for your cold environment use.

I always (summer & winter) use 91/92 octane clear (non-ethanol) gas. I can't seem to get consistent answers to my question:

Is 92 octane clear exactly the same as 92 octane mogas except without the ethanol?

What say ye all?