Question about Segway-Ninebot P65I

I did buy this Scooter P65 before a 26 days i think , they said the max range is 65KM , I'm a Persom with 80Kg and i charge the battery up to 90% max , so when the battery is 90% full it give me about 28 -30 km ( i use eco mode must of time little time i use sport or drive mode ) is that normal or should i report it to digitech ??