Most of what you read on this forum is about slow boats with reasonable fuel economy. This is the distinction between a displacement hull and a planing hull.
That boat is not slow. With a clean hull, probably plane about 30gph, 15+mph, just guessing. WOT, don't even want to think about it.
The market for old gas guzzlers is tight. Don't expect people to line up to buy it at any price. Completed auctions on eBay might give you an idea of real sales.
I do think Californians are very pretty boats.