After 20 years of running friends' boats (IO,OB,Comp ski boat) I am finally able to buy one. It will be docked during the summer on a fresh water inland lake. I cannot decide between OB or IO. I love IB ski boats but they are too costly. It will be used for pleasure and skiing, Any opinion on fuel economy between IO and OB. I think I am looking for around 175 hp IO or 115-125 hp OB. Seems that OB are less labor intensive on this sight but I always understood IO's to be easier to work on (mistaken?). Any input would be great, thanks.