Daily Driver Engine 318 vs 360, what one?

Kind of an apples to different kind of apples comparison, but...

My 73 Satellite 318 2 barrel, bone stock except for dual exhaust, with 56,000 original miles, weighing 3770 pounds estimated 150 factory NET HP, plus about 20 for the duals, for a total of 170 NET, with a 2.73 gear---average 14 MPG carefully monitored over the last 1500 miles, in mixed driving on 89 octane.

My 2000 Dakota R/T 5.9 (360) MPI, stock (roller cam, molly ring) except for cat back duals and K&N air filter, with 138,000 miles, weighing 4200 pounds listed at 245 factory NET HP, with O/D trans and effective final drive of 2.7x---average 14.1 MPG verified to within .5 MPG by factory EVIC computer in mixed driving on 87 octane.