Dude, no reason to leave out a bad tank MPG due to maintenance.
I have had a couple of sessions such as these, I just made a note about it, and left it as is. Tracking your fuel mileage isn't like sorting good from bad fill ups.
Just because someone gets a bad mpg one tank (in my case, the van) does that mean I should not report it, so it doesn't throw my numbers? No. All those are considered part of your real life usage. So don't throw it out, just add it in, it will be fine. The average will swallow the difference and months, years from now, the impact of that will be nothing on your average.
My van has over 160 fill ups. Nearly 45 thousand miles. The fiance is driving it for in-town use right now. The MPG has gone from an average of over 21 to 11 with her driving. I still count them, even though they are actually dragging my average down. You only have one that will affect it only slightly. Don't worry about it! Winter for me also brings my averages down, but I still count them.
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