The miles remaining is computer generated. If you are getting 30mpg and the light comes at 60 miles, that means that you have "2" gallons left. But, if your mpg drops to 25 or even 20, you are going to be in a pickle :)
Yes, a hard turn might move a gallon to the wrong tank and it does take a while for the 2 tanks to level out, that would leave you with 1 gallon - oops!
I have run out of gas at the gas station pump. That resulted in multiple misfire codes until I cleared them!
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Keeping it running is better than buying new
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