Odometer at fuel-up #84 is 57154km and is 57806 at fuel-up #85. The corresponding mileage at fuel-up #85 should therefore be 57806-57154 = 652km whereas the mileage calculated by Fuelly is only 136km. Of course, the MPG is off due to the wrong mileage calculation.
I tried to delete fuel-ups #84 & 85 and create new ones but still get the same problem. I also tried entering fuel-up #85 using mileage option. This was OK however, upon swithching back to odometer option for fuel-up #86 I get a new mileage calculation error for fuel-up #86...
Anyone can help ?
P.S. I didn't miss a fuel up and always fill to top of tank.