[mbork_pl]

> Is a spreadsheet even necessary on the go? Might be better to just have a calculator and store values in a text file?

You might be right technically, but one of the features of a spreadsheet is that it stores formulae. (Like a programmable calculator.) Even better, it does it spatially (which fits the way many people remember things), so after a while you can train yourself to put "kilometers driven here, amount of liters of gas there, and your gas usage per 100km is over there" etc. You can do this in a text file, too, of course (see e.g. https://www.gnu.org/software/emacs/manual/html_node/calc/Emb...), but a text file is essentially 1-dimensional, which may be a drawback here.

[fallat]

I know, but the problem with that is now each cell is essentially a calculator, and it only makes sense to store numbers, and even on small devices, dealing with spreadsheets isn't the greatest because of screen size. Building discipline also to record data like this just to review once in awhile sounds like a lot of work, vs just opening "L/100km.txt" and calculating. Heck, you could make the calculator program be able to open files where each line is a number and operate on that.