What makes ethanol attractive is its ability to increase the octane level. Your car will run nicely with 10% ethanol, so long as it is a daily driver. If you car sits for long periods of time with high humidity, the tank will collect water.
I use 10% in my car in the summer, then switch to 100% gasoline before winter storage. I typically do not drive the 1995 850 from December to April, when the salt is off the road. No snow tires needed!
I agree with using ethanol free for the small engines. They typically do not use a lot of gas, about 5 gallons/summer.
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Keeping it running is better than buying new
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