For my wife's car it says I'm averaging 7 fillups per month, and that doesn't seem right. Started using it in November with 14 fillups. 14/4 = 3.5 not 7. Even if it wants to exclude November since there was only 1 fillup at the end, 14/3 is 4.66 which is also not 7. Not really sure how it came to 7 per month at all.
I'm seeing 'averaging 5 per month' for "Julie's car" which I guess is the one you are talking about. Of course I am seeing it after one more refuelling so that may change things since there was a gap of a couple of weeks.