GURPS Vehicles had some options that you needed to do a little calculus for, iirc. To be fair, that was an extremely optional add-on, and the calculations were done as part of designing your custom vehicle, not in play!

Their speed/range penalty calculation is also logarithmic I think, but nobody actually calculates that - you just look up the adjustments on the table, which is reprinted all over the place (rulebooks, character sheets,GM screens...)