Nowadays I use preset more often than before.

You should already know your own vehicles punya tank range. How much is full tank from empty, have a rough guess how much to full from any level bar shown on the meter. Bloody pay attention to your vehicle lah....

Kalau takut Salah, you can over preset punya. It works just like normal rm200 auto hold.. If you pump less than the preset it will only charge how much you pump and refund the preset hold balance after few days. At least you can decide how much it can hold.