Fuel Lines Urethane (Blue) vs Standard

Several years ago, while I was preparing to do the fuel system on the current project, I had simular questions. I made up endless loops of the available fuel lines, one set filled 50% full of ethonal free mogas and one set filled with 10% methonal. I hung these loops in an area exposed to direct sunlight and exposed to all weather elements. After one year all the lines except the blue urethane showed signs of deterioration, from minor to complete failure, the blue urethane remained unchanged. Three years later when I tired of checking on the test pieces, and threw them away, the blue lines still appeared serviceable. This was just a test of the products I had on hand not a market evaluation. It is sure an eye opener to see how quick some products deteriorate under those conditions though. 

Ok. Thank you :)

I have had other similar answer´s and these fuel lines seem to be standing out of others with life time and ethanol mixed mogas, As ethanol free is not available here in Iceland. We are going to use them for our system.