I noticed that the fuel meter is very conservative, but then, there isn't a reserve option on the fuel tank. As I understand from the manual, once you hit the bottom of the fuel gauge, the trip meter starts counting up. Now 30% reserve is a little on the high side, many bikes run from 10% to about 25%, but is not ridiculous, given that the Tenere is an "adventure" bike.

A rough calculation suggests that the tank (full to empty) is good for about 300miles depending on how you are riding. Realistically, with a range like that, I would be looking for fuel somewhere about 200miles, which, spookily enough, is about the bottom of the fuel gauge. This allows for a certain amount of "shopping around" if the fuel in the area is scarce or particularly expensive.

A lot depends on the rider, but I have always filled up the tank completely, and then ridden to the odometer, rather than the fuel gauge.

Regards

Si