owner of a great old 73 model sea sprite 16' deck boat with 84 merc 115 tower, and 71 4hp kicker, but would like to get something a little bigger, and of course more fuel efficient. this larson is selling cheap, and it appears to be in great shape. motor purrs like a kitten, outdrive was gone through a couple years back, receipts to verify of course. I've never owned an i/o, any comments on this 1977 mercruiser 165? are they reliable? fuel consumption? thanks in advance for the advice.