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I think you just hit on something here. The 5.2
version of the Magnum motor may be the ticket
to higher mpg. It's already blessed with a low-friction valvetrain and very efficient heads with
decent sized valves. All it needs is a good "torque type" cam to get the job done. 
The cam you are looking for is already in there. They are ridiculously small, I think even smaller than a LA318.
similar duration, more lift.
if you want a good cam for a roller 318 that is a good balance of power and economy, get the stock cam reground by bullet cams, and use their HR259/316 lobe for both the intake and exhaust. pulls very hard in my magnum headed 318 roller motor.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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