I have a really cheap friend who would tell me things like, "Only fill the laundry detergent cup up halfway. They make the cups too big on purpose so that you'll buy more sooner."
But my girlfriend always tells me "Always double the dosage on medication recommendations. The suggested dosage is always to avoid liability. The rest of us can never get better because some 80 lb girl might get a stomach ache."
Who should I believe when I measure things out?
I've decided to split the difference and use both patterns of logic. Like when in the same day I eat no vegetables but drink 8 beers. Vive la difference!
