Gas-CAP current includes a rudimentary Save function.

At the bottom of the screen, there are four buttons:  Save, Restore, Import, & Export.

The Save button can save one scenario at a time.  Clicking the Save button saves the current scenario.  If the Save button is clicked again later, the first scenario is erased & the latest scenario is stored.

The Restore button recovers the scenario that was "Saved".  Clicking on the Restore button will bring back the saved scenario and erase the current scenario.

The Export button allows a more permanent Save.  After clicking the Export button, a box with many characters will appear in the middle of the screen.  Copy the contents of the box into a text file & save on your computer.  (Note, there is a scroll bar.  To select the entire contents, put your cursor at the beginning, then while holding Shift, scroll to the bottom & put your cursor at the end.)

The Import button reverses the Export function.  After clicking the Import button, an empty box appears in the middle of the screen.  Copy the characters from your text file into the box and hit "Import."  The saved scenario will now appear on your screen.

Note, more sophisticated Save functions are in the works.  See Future Features.