Sharon & I went to see my long time friend from public school who now lives outside of Athens Ontario this past week. We took "Sherman" and cruised across Hwy 7 to just past Sharbot lake then to Westport and to his place on Charleston Lake. Grandville ran "perfect" and got close to 17MPG even with A/C on!!  Came back yesterday by way of Kingston along Hwy 33 [ ferry boat ride at Glenora] then to Trenton, and Hwy 2 to Port Hope & back roads from there. Oil level was down about a 1/8" on stick so that was good too!!! It's like taking a trip in your "lazy Boy" chair!!!!!!! about 450 miles total trip!!  Had a great visit with 2 "Monsoon" storms & found out back window on convertible top leaks a bit but it was really hard rain!!   Exhaust tone with new mufflers is just " PERFECT" not loud but 455 sounds good!!