Not quite. The reason behind carrying only the minimum required fuel is because any extra fuel itself has a weight which means the aircraft is heavier and is therefore consuming more fuel (heavier plane more fuel hungry than lighter plane). We are talking about a figure that's less than $100 for 1 tonne of extra fuel carried.
akindofmagic, yes we do. I've only ever diverted once from a go-around and it was a bad experience fuel wise. Other's speak of a similar experience. I agree, no excuse for not reporting it. I will look into it deeper.