Quote:
Originally Posted by TheIVJackal
But wouldn't that assume that I used two gallons by the time I fill-up?
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NO.
What you already used up, you'll need to add again when topping up.
What's left in the tank, you won't need to add again
Keep the miles counter running until you fill up completely, and add the previous 2 gal to the volume you tanked - done.