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Sorry but you will have problems sooner than later.
Methanol/ethanol will corrode the aluminum eventually. It's best to drain the cell after use.
There is no real timetable because every situation is different but it will happen. The top lubes today definitely do help but won't totally stop it. An old trick that I learned from an alky racer back in the 70's was to "pickle the tank" with a mix of 1 gallon of vinegar to 3 gallons of water, let it sit overnight or longer. I had a Moon T-tank on my dragboat that had started to corrode, don't ask me what the chemical process is, I don't know but it worked. Could go a whole season without getting any chalky residue in the fuel filter, which for me was the warning sign that corrosion was starting. Treating the tank at beginning and end of season has become a regular part of preventive maintenance program.
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