distance to next fill display. Hi all, I have a well kept and Nissan serviced 2012 xtrail (T31) and I fill it until I see it come to the top of the fill tube. I used to get a prospective mileage indicated of around 710 Km. and now I only get around 620Km. This has been the case for months even though I am the only driver and my habits haven't changed. I read a post about the air filter last year and I have had that checked and cleaned at every service. Has anyone any ideas?