I have just bought a 1979 HUnter 27. She is beautiful. Amazing shape and two surveys, one form the dealer and one I had independently. Minor minor things wrong (the fire extinguishers are not up to code) anyway I live in Buffalo New York and the boat is in Erie Pa., anout 100 miles away. I am going to sail/motor the boat but I am wondering if anyone knows how many miles per gallon it may get. It is a yammar 1 cylinder diesel and it holds twelve gallons on board. Also will running the engine for 8-12 hours, if I had to be allright? Has anyone ran an engine for that long before. Thanks