Q: I meant, how many miles AFTER it reaches 0 miles empty ?What's the reserve on 2002 Ford Explorer

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(1) Answer
Only way to know is run it until it quits,....... runs out of gas!........ I think it won't take long but there is no 'for sure' answer to your question. ... Can advise to try and keep at least 1/4 tank in it at all times.... The in-tank fuel pump will have a longer life that way!!