Lots of these early boats are still with us, of course, because they were built like tanks. The heavy hulls ran well in rough water, but were somewhat slow, wet, and not very fuel-efficient. That didn't matter in the mid-'60s, when gas wars drove fuel prices to as low as 30 cents a gallon, but all that changed with the Arab oil embargo of the early '70s. Fuel-efficiency suddenly became very important. Then, in the '80s, everyone decided they wanted their boats to be fast. Slow was out, and manufacturers rushed to find ways to lighten hulls without compromising strength.