Ah, the old "after the flash, when will I be walking?"
Willie - why would you trust us?! our imaginings could leave you Km's from civilization!
Seriously - I've not seen "flash-to-walking" mileage figures printed many places.
Perhaps you can find the info, in whatever language, surely? - of your tank's capacity.
Ride and learn your mpg's - when the light comes on...refill.
Do the math afterwards? That was your 'reserve'.
How far we ride when the reserve light comes on can be so different for every scooter, for many reasons. But, you're right - you should be able to get a ball-park figure after a little experimenting to learn your mileage.
Now I will got to the map and look for the Canary Islands.......
We love photos here! If you could post some?!
Regards, Stig