How can you save fuel?

Your answer is correct. In German traffic rules, saving fuel involves reducing resistance and optimizing vehicle efficiency. Maintaining the correct tyre pressure, as stated in the owner's manual, ensures better fuel economy because underinflated tyres increase rolling resistance, causing the engine to work harder. Removing roof racks or ski racks also helps because they create additional air resistance (drag), which increases fuel consumption. The third option, "Avoid driving in top gear," is incorrect because using a high gear at the appropriate speed actually helps save fuel by lowering engine speed and fuel consumption.