For highway travel you could start with filling up every 200 miles (325
kilometers) and see how many gallons (liters) it takes.  Then adjust
from there.

City driving takes more fuel so you'll want to start with filling up
sooner and make note of the fuel used so you can establish what your
vehicle requires.

Mike

Burdett, Jean-Pierre wrote:
> My bus has a dead fuel gauge...So how far are you driving on a tank
> before fillups as a rule of thumb?