Later model 3.8 swap in an "A" body

krazykuda said

My brother had a 97 dakota with the 3.9 L v-6. I got better mileage with a 318 4bbl in my 68 Cuda and 2.76 axle (17.75 MPG vs his 16 MPG). :sad5:

Who would have thunk it??? :sign7:

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I'm not surprised by that. Lots of factors play into MPG. Not only gear ratio. Accesory drive loads like power steering, alternator usage, engine wear. If you can reach into and old 318 and turn the engine by hand with the drive belts you can bet its using less fuel idling in traffic than a tight new 4 cyl that wont turn by hand.