Well, this site has the added feature above Excel that we share our information to compare what our cars are doing against others. On top of that, the owners can trump me on this, but they've said it before that this site isn't about tracking money on fill ups because that particular aspect is out of their control.
I do understand where you are going with wanting to separate data for billing, but, thats above and beyond what this site is really about.
Just my view.
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