The water tank on my 2006 cc23 is right were it is on the cd 22 rear dinette seat i believe its 20 gallons also there is not a water heater or the gussied up interior it looks more like the cd 22 .The economy seems about the same as my cd 22 with a 90 hp suzuki with 14by 18 prop the cc 23 has a f115 yami with a 4blade 17 by 13 pitch top speed is about the same for both about 32 mph . I will post the economy figures when I get home from brazil next week . The boat so far is awsome it does everything well skinny water ,speed , and economy better ride I love both of them just the cc23 a little more .