If you are still calculating fuel status manually then isn't it high time you switched over to an automatic single or multi-engine aircraft fuel management system – if not for your own safety, at least for the safety of your passengers?

A modern single or multi-engine aircraft fuel management system especially like the ones manufactured by J.P. Instruments not only just displays the fuel consumption and fuel in the tank(s), it can be integrated with your GPS so you know if there will be enough fuel for your selected flight path. You can even change the flight mid-way and the integrated system will recalculate the fuel requirement as well as reserve quantity at end of flight path or balance fuel ... Read more »