318 MAX fuel economy builds?

very much agree. Not totally comparable but drove my old 83 D150 2 hours to a car show. Has just a mild compression, RV cammed 360 with a 4-speed. Was a blast to road trip it there. Mileage wasn't half bad for a full sized pickup either. I believe I got up to 15 on the way there.
You need to be careful with that 360. It may get the best mileage of any one ever built. :)

Every factory built 360 I have ever had have been gas sucking thirsty pigs.