Super 8 125 , fuel gauge

[ginger cat]

Hi , since i bought it had an average MPG of 60 miles then i realized that they fuel tank is 6L not 4L but dealer assumed the low MPG is cause of the cold weather + choke. So i did couple of tests and found out that when needle is in red there is like 1.5L-2L left in the tank. I was basically refuelling whenever it would hit the Red Zone and it would always fill up ¬4L of fuel. Or is it possible that im dumb and the tank is empty when needle is at the botoom like when the scooter is parked?

[Vivo]

Same with my s8 125, When the needle is at the red level, there still lots of fuel left, around 2 liters...

[ginger cat]

So it probably means that tank is empty when needle goes to the bottom under red level ?
Ok thanks.