Well, you're *kind of* stuck. If you re-set it now, it'll be off by what you've already traveled. Here's my solution:
Leave it alone until NEXT fillup.
When you fillup next, it'll have the miles for BOTH tanks - so when it asks for gallons, just add the two fills together.
So, instead of 500 miles on 50 gallons just tell it 1000 miles on 100 gallons (using round numbers for easy example). It'll come out the same.
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