Maybe She means dollars, or quid, or deutschmarks or yen.

why even top off at all? i don't think there's a single benefit in doing so

I've heard that it can fill the carbon canister and ruin the emissions system or something, I have no idea the validity of that claim.

Should have clarified... I meant Dollars, not gallons.

SHE meant dollars.

I wrote SHE, didn't I? (Disregard the 'Last edited by:' message haha)