Yea, the mid 60s Mobile economy runs. That's when they were getting concerned about fuel economy, as gasoline prices were soaring past .15 a gallon! LOL
Actually I think it was more the mind set of the people buying these cars new, my parents for instance. That generation grew up in the great depression and could be somewhat frugal.
I think it was valuable PR for car manufacturers to claim they won the Mobil Economy Run because that generation was listening.
I think my dad had 4 different cars with /6 power over the years. I still remember them shopping for a new car and I actually talked them into buying a new 1967 Dodge Coronet 440 white hat special with a 318!! Only V-8 they ever owned.
