By Tobias Carroll When you think about improving a car’s fuel efficiency — whatever that fuel might be — there are a few steps that come to mind, usually including mechanical and electrical efficiency. (Use a higher octane! Use the air conditioner less frequently!) One advantage that electric vehicles may well have over their internal combustion counterparts is that they can get an extended range through a simple software update. Engadget reports that Porsche has just announced a software update for its Taycan EVs which will have the effect of adding around 31 miles to its range. (The specific…