I only got 9.3 planets, so I just have to work harder. A Hummer or Ferrari would go a long ways to lowering my mileage. Especially if I put more than 500 miles a week on it.
They're trying to slide a lot of hidden assumptions past the reader. For one thing, you get a lot more efficient use of resources when they're privately owned. Freedom brings wealth, not the other way around. Wealth, in turn, lets you optimize your resources.
Free people bake bigger pies, and lots more of them, than serfs. Marginal acres get used for something productive, while the best farming acres are worked by the fewest people, and still produce enough to feed ourselves, and much of the rest of the world. Meanwhile, the non-farmers use the other acres to produce more non-agricultural wealth.