Ah, so it's a badly-worded view. It could be called a "gain/loss graph". That perspective would be much more useful in business. It's so useful that car dealer

Ah, so it's a badly-worded view. It could be called a "gain/loss graph". That perspective would be much more useful in business. It's so useful that car dealerships have been fighting the same idea - the change from MPG to Gal/100mi.