Visually gauging remaining petrol?

[jimsym]

After giving the fuel system a good clean i'd prefer to keep myself from using the reserve tap.

I peered into the tank, but realised I dont actually have a good estimate of how much fuel is left. It seems there are three or so raised 'humps' (middle one pictured) which might make some good visual markers.

Thoughts?

[CaNsA]

I fill up every 100miles.
reset the trip at every fill up.
I can get 120 miles before I need to hit the reserve.

[banner001]

I fill up every 100miles.
reset the trip at every fill up.
I can get 120 miles before I need to hit the reserve.

same here, except i just leave it in reserve always.

if im doing motorway only runs i fill up at 140miles, commuting i fill up at 100-110 miles.

[bendog66]

I fill up every 100miles.
reset the trip at every fill up.
I can get 120 miles before I need to hit the reserve.

+2