What they said.
If you are resetting the trip meter and the average MPG gauge at each fillup, you should be getting something around 10% over your conventional calculated mileage (although that can fluctuate wildly under certain conditions). Keep a tab on the calculated mileage as a comparison. If you know how to use a spreadsheet, like Excel, or Google Sheets, keep all your entries there -- something along the lines of this thread
versa-real-world-mileage-against-trip-c ... l#p6615408. Keeping a close eye on MPG can alert you to changes in your car's performance that might indicate issues that need attention, as well as fuel sonsumption, operating costs, etc.
Happy driving!