Hi,
Most racing programs rebuild or go through their drives every/every other race.
Family Cat mentioned Catalina and the Delta. If I had my choice and my family with me no doubt would I choose twins. No matter how reliable the packages are today who want's to run home from Catalina at 6:00pm and have a problem mid-way? Twins give you piece of mind in large bodies of water.
Fuel use is relative. The motors work less to maintain let's say 80mph vs. a single ..but I still have 2 motors burning fuel.
Family Cat -we are the second owners. The boat came from Lake Tahoe. I don't think I mentioned this boat has ProchargersM3's(5psi). In Tahoe the boat runs mid 90's. Sea level is over 100mph. Great thing is no adjustment needed if you want to run different altitudes ...computer does it all.
HotLavey is your boat the blue graphic 275? If so, very nice!