The 318 has never been known for good mileage. All else being the same what is the real difference between the mileage potential on the 318 and the 360?
However! I did manage 20 out of my 360. It was a ‘79-360 in a Magnum, with a OEM 4bbl intake, 600 cfm Edelbrock, MSD 6, dual exhaust off of the manifolds, a 904 & 2.76 gears on 26 inch tires.
A 318 is good for another 2-3 mpg’s in a lighter vehicle.
The Magnum weighed in at 4,000 with me and a gas tank filled.
