Synthetic oil

Just flicked thru a "Mopar" magazine the other day.
Their test engine, 383 I think, picked up 16hp on the dyno going from 20/50 to synthetic 5/30, with no other changes. Not bad.
BTW the electric waterpump drive picked up only 1hp but 6 ft/lbs.
Hardly worth the expense? tho 6 ft/lb is 6 ft/lb.