The motor come out of a 71 marquis.....don't know....maybe jetting difference. 460s were/are gas hogs from my recollection. Owned a alignment shop at the time and just happened to come across this car and couldn't pass it up.17? I'm amazed. Had a 79 with a 460/NP435 4 speed and got 9.5 mpg, pretty much year round. Had a similar vehicle (weight/form factor at least) in a Dodge Ramcharger that got 14mpg. Just amazed you were getting mileage that good with a very similar drivetrain.
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