I am considering a 41 Commander MY early '80's vintage. How does the boat handle at sea and at the dock? The one I am considering has the original 454's. I know it is not a speed demon, but what are for real numbers for speed and efficiency be? If the boat is kept to hull speed say 8 or 9 knots will it get 1.5 miles to the gallon? Are there any particular qwerks to look out for when looking at her? Thanks!