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Location: 31 | This has definitely been the best and most informative e10 versus ethanol free thread for me… I learned some new things. I made an error in wording when I said that ethanol can “attract” water. Hopefully we can agree that water in fuel is not a good thing, and the millions of vehicles that run flawlessly on e10 every day "might not" be as relevant as this would imply for our boats that sit for months at a time.
Will that said: I like Steve's idea on asking the gas station attendant how often they refill their storage tanks. I also thought that VMS made some excellent points on temperature condensation, as well as one of the reasons why fuel is stored underground. IMHO, although the underground tanks are supposed to be 100% sealed, as are the trucks that deliver them… these are also controlled by mistake prone humans.
Regarding additives; for the most part I only use the Yamaha RingFree to help reduce carbon buildup, and do not use any other additives on a regular basis. Although it was originally developed for marine 2 cycle engines, it's supposed to still do an excellent job of de-bonding carbon deposits in the 4 strokes too (carbon buildup is much different in outboards than automobiles due to the difference in combustion temperatures). Anyway, other than possibly being brainwashed by Yamaha, I still think that this RingFree stuff is beneficial for both motors, especially for the 15hp which is almost exclusively run in the mid-level RPM range while trolling.
For the record; I'm definitely more fearful of getting a bad load of gas than having the e10 retain water from humidity now. However, I'm still going to be targeting newer gas stations that have a high turnover rate and the non-ethanol premium, with a preference for the 93 octane rating to help combat the loss of octane and damaging effects extended periods of non-use can have.
Edited by Jerry Newman 3/1/2019 5:36 PM
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