Does ethanol E-10 gas deteriorate seals any faster in a car engine than a boat engine?

I am putting my boat and car up for storage for the next 8 months. I can buy ethanol free gas for my 5 liter boat engine, but I can only buy E-10 gas at the pump for my car. I have heard E-10 will not affect an auto engine, deteriorating rubber gasket or seal components, but I hear it eats at the seals and gaskets in a marine engine. What is the truth?