Back in 2001 my 1975 slant six dart was my everyday driver I drove it to school work etc. It was my only means of transportation for about 2 years. Back then I got an average of 18-20mpg thats driving around town stop and go while going to school along with interstate duty going to work. The best I ever got was I took it on vacation and on the way it was all interstate and I remember getting 23mpg. Shortly after that in 2003 I bought my 85 ram 318 it got about 9mpg no matter what lol. So I used to dart on nice days and the truck when it was less than perfect weather. Or i needed to haul something. And this lasted until 2004 when i sadly locked up my slant. I drove that 85 off and on (I always had 2 vehicles on the road) until 2012 when I got my 2001 ram and I still drive my 01 everyday.