thanks for your replies.
I guess vapors would come out on your next fill. You'll notice that a tranparent smog comes out of your tank once you opened it for refueling. Also, if you make your tank empty, the more times you will go to the gas station. The more miles you'll spend. In addition, contaminants are settled at the bottom of the fuel tank. If you make your tank near empty, your engine will be susceptible to these contaminants.
The best way is to test it as what have been advised. Any more tests guys?
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