Not the same model but in my '65 I'm currently averaging about 14 on a trip, which means some interstate driving, some 2 lane, very little city. It will go down to mid 10 if all I do is local driving. I'm currently working on improving that with some tuning, basically getting as much ignition advance as possible. Mine's a 4400# car, 3.00-1 gear ratio, 3 speed Cruise-O-Matic, 390 with a mild hydraulic roller cam and EFI.
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