Fortunately, I can't remember having this problem as most of the time I can only get around 15 to 16 gal in my 18 gal tank even with the air let out.
Also, most Dominicans will tell you it is best to have them turn the rate of flow of the gas very low when one is filling up. I don't know if it works but if you ask the guy to do it for you a small tip is usually expected - RD10 - RD20.
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