So you're gauging your mileage off of filling up 2 gallons? Sounds like you have a good fillup method and are seeing good results, but I would still take such small tanks with a grain of salt.
I would leave the dam alone unless its really scraping. It should trim itself as needed, as long as you don't hit anything hard enough to rip it off. I would also pump the tires up to the sidewall max.
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