Originally Posted by onenationundergoat
Well there's the Appalachian Mountains... so no. Then there's the foothills, where I live. It's relatively flat but not Kansas flat. Then there's the coast, which is definitely flat.
I was trying to be funny and not doing a good job. The taller your gears are(lower number, more highway), the more powerful your engine needs to be to keep your bus moving at highway speeds, especially when you hit the hills. If your bus had a 10 speed like some of the older buses, you could keep your rpms in that sweetspot and not lug your engine everytime you hit a hill.
Simplistic answer from the simpleminded.