/6 Mileage ?

When I was a kid,I had a 66 Dodge. 2 door post,225/,auto. (Wish I still had it) 24-25 mpg hi-way. When I got out of school,bought a 72 Duster,318-auto. 22-23 mpg hiway. I started pumping gas at my Dad's station,when I was 10,and prior to the smog stuff of the eary 70's,20 plus mpg,even in big cars,was not uncommon.

The below quote came from Moparstyle.com.

1975: The new Feather Duster and Dart Lite were introduced. They got 24 city/36 highway using their Slant Sixes and Overdrive Manual Transmissions.