Hi Chuck:
From what I have heard, MTBE is now a thing of the past and will not be back in our gas. The switch is to Ethanol which took place here in CT in Late October. MTBE was causing ground water pollution from gas station gas tank leaks. Not a good thing. It may be a thing of the past elsewhere as well.
At the same time, the 94 octane Sunoco was changed to 93 octane as the MTBE also acted as a octane boost causing good clean combustion. You may notice the little blue signs on each Sunoco pump saying "New Formula - Same Quality". One of those is on my tool chest now... Hee Hee. You did not hear that from me.
I am not sure what effects the present Ethanol has on gaskets and lines. I suspect not much, otherwise, there would be warnings and "talk" of which I have heard none. However, over the long run who knows? I have that new braided line and blue tank line so if feel pretty safe there. The gaskets in the carb, etc are what we need to wonder about.
In the Obsessive/Compulsive zone... ahem... I have been dumping a can of Turner Lead Additive and another can of Turner Octane Booster into the tank with each 12 gallons. You can get this stuff at AutoZone or wherever mouse milk is sold. This is just insurance as my compression ratio is on the high end of low, or the low end of high
