Honestly, I have no idea how I could calculate gas usage on my boat (2005 Tige 22i). I would say that there are so many variables, how you drive, are you cruising with your wife, or pulling a rider with 12 friends, 4 coolers of beer, and 2k of ballast? If I had to guess, and it is just a guess, I would say that Tige's are comparable with other size boats with similar engines.. Sean
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