I daily drive a 68 dart with a slant six and an 833 od. I get 14 in town and 17 on the highway.
I have electronic ignition on it and I could probably get better mileage if I was easier on it but I tend to be a lead foot and don't let a lot of people pass me.
That sounds about right. I’ve owned and regularly driven probably a dozen slant 6 cars in my life and never saw much better than around 18 mpg on the highway. Of course, none of those had an OD transmission.
If I could average 17 mpg in mixed driving, I thought it was good enough since I always tuned for power...not mpg.
