I'm with Troopy here. Unless you fill from a dodgy jerry, or get a load from a dirty fuel supplier, fuel is usually clean.
Nowadays they use plastic underground tanks, so rust etc. will become a thing of the past.
Being underground, they just have to keep the water out.
Besides, Toyotas have a pretty good pre-filter on the end of the pick up.
For you to have 20-50Klm. range when the low fuel warning comes on.
The p/up. has to be within 10mm of the bottom of the tank structure.
Right in the middle, or lowest point, when vehicle parked and level.