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I am quite sure you don't have a 5.9L, as at 65 it need to turn 2500 to have enough power to keep going.
More likely you got a 8.3L 300/330 HP to do 1350 at 65MPH. & 9-10 MPG is pretty close the best you will get. 1700-1800 RPM is too high for economy, that's the range for montain, where you need power to climb & RPM to cool the engine. I don't think they made pusher with small block.
wrench |