Are you referring to your Truck?
Fuel Log- http://www.fuelly.com/car/ford/f-250...ker/285374/log
Looks like Aug 9 and Aug 13 have duplicate entries. The first displays the MPG correctly, but the duplicate with the exact Odometer entered means no travel/difference, therefore no MPG.
Simply edit-> delete the duplicate entries and you'll be good to go.
Also, same thing for July 19's fill-up as it's also a duplicate.
Not exactly. I reviewed both of your vehicles in your Garage and the recent fill-ups without MPG data is because you marked them as a "Partial Fill-Up".
More info on Partials: http://www.fuelly.com/faq/6/partial-fuelups