A modified version of BurnTimeCalc with the addition of an EXT button that allows you to add extra fuel mass in the calculation. Very useful when you are flying ships that carry external fuel tanks (like the XR series).Â
-Changes
EXT button, where you enter the extra fuel mass you are carrying in kg. It may be RCS or an External fuel tank or even the total.Â
Remember to hit the Reset button, BurnTimeMFD doen't know whether you've used any of that extra fuel mass or not.
Slightly different colors for improved visuals.
Many thanks to  D Henderson, C Jeppesen, Topper for this great MFD. I never fly without it.
-Source code included