Amphicar: Think of the Shortcuts!

If you can shorten the route you take by finding a detour or shortcut it can save on gas. Imagine cutting across a lake with the Amphicar! Of course as a boat it will get poor mileage due to the enormous drag involved in pushing through the water. Being an old car it probably also gets poor gas mileage on land. But the idea of shortcutting across the narrow waist of a lake instead of commuting all the way around it and saving gas as a result is fun to think about.