I refueled my car tonight. The gas indicator was doing the blinky warning thing, so I knew I should probably fill up. However when I filled all the way to the "thunk" sound the gas nozzle makes I only put 25.18L into the car. I'm curious as to why there's the big discrepancy between the 35L listed tank size and the 25L fill up?

Is there some sort of reserve in the tank that doesn't show up on the indicator? Just curious.