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In the early 90's I bought a '64 Mercury Comet with a 289 and Mercruiser Overdrive and my city mileage was often near 25mpg. Much lighter than a Crown Vic though.
I've owned a few 5.0l cars over the years. Mostly '89 and later EFI stuff. I put an RV cam in one out of a Mark IV, and though I wasn't going for fuel efficiency the results were almost a 50% improvement over a carbureted 302.
I would be curious how well a higher compression setup with "ski - ramp" intake porting tuned and cammed for low rpm efficiency might perform.
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2̶0̶1̶3̶ ̶V̶o̶l̶t̶ ̶-̶s̶p̶o̶r̶t̶i̶n̶g̶ ̶s̶e̶a̶s̶o̶n̶a̶l̶ ̶g̶r̶i̶l̶l̶ ̶b̶l̶o̶c̶k̶
2013 Volt- wife wanted one too. Bye Leaf
2017 Volt Gen2 Red like all cars should be.
1997 Landcruiser (Bruiser) -sadly gets about 11.5 MPG... 
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