How do i make my mopar a daily driver??
So using a 318 instead of a 360 should also help MPG . (I'm past the big need for HP)
One would think the 42 less cubes of the 318 takes less fuel to fill the cylinders, but the 318 might have to work a little harder than the 360 and offset that some.
Generally speaking the 318 would probably use a little less, but I don't know if the amount would be worth the change.
Tune is probably where you could get the best MPG possible, and vacuum advance is a big part of MPG tuning.
Just for information I run 18 initial, 34 with mechanical added and with vac advance added around 52 degrees total. (most of the time at around 5,500 feet elevation)
Generally, the more timing you can get in at all throttle openings the more available fuel gets burned and therefor the more efficient the MPG is.
BUT, it's a fine line before you get into preignition and possible engine damage, and this is why an EFI system is better at deciding tune than a lot of people can tune a carb.
Obviously just my opinion.
