Is this really your opinion, or are you just trolling?
Here are some of the differences between a car and a boat.
Most folks drive cars pretty much every day. National average is somewhere around 15,000 miles per year. That allows the owners to know their vehicle very well, and the range that it is capable of. Their average MPG is very consistent. Wind speed, load, speed have pretty minor impact on MPG. Every modern car has a reliable fuel gauge. It also has an odometer and trip meter you can reset after fueling. A computer that shows distance to empty, and average MPG. When you are in a city, you are pretty much always within a couple blocks, or at most miles, of a fuel station. When you are on a road trip, there are multiple ways to see how far you are from the next fuel station. Even when you are in very remote areas of the country, just about every vehicle on the road can comfortably go from point to point without worry about running out of fuel if you start full.
What about boats? Average hours on a boat seem to be around 40/year. Used 3 months a year. Often only a few weekends and one trip. Unlike cars, there is no mileage tracked, only hours. And no way to reset between fuels. MPG is wildly inconsistent, heavily impacted by wind speed, load, MPH, recreational use, etc. No gauge to show distance to empty. I've owned and rented a lot of cars. I can only think of one where the range on the bottom side of the tank was significantly different than the top. I've also owned a lot of boats. Literally EVERY one of them the bottom side of the tank drops significantly faster than the top. Not to mention that once you get to a half tank, most fuel gauges will bounce from 3/4 to 1/4. At any lake in the west, and especially Powell, the distance between marinas is substantial, very different than on land.
I could go on, but don't need to.
Most rational people would agree that there is very little in common between the two......