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A stock 390 with stock 4 bbl motorcraft no A/C gives maximum 11 MPG city and 19 MPG interstate. BUT, everything has to be right ( Timing, clean carb, carbon free valves and rings, right compression, oil pressure etc.)
That milage was using unleaded regular gas. Don't know milage with todays 10% ethanol garbage.
Last edited by t-bird-art; 08-23-2010 at 10:25 PM.
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