This morning I woke up to 8 inches of new snow. This is actually good. It's what you want on Christmas morning. After I dug my car out I needed to run an errand. Everyone is familiar with the procedure for getting a gas car moving when stuck in snow. You give it some gas. If it doesn't move, you stop because it will just make it worse if the wheels just sit and spin. Then you try to rock. Hearing the speed of the engine is an important part of the process. When I got stuck this morning, I wasn't worried because it was level and I knew I would get moving eventually. I discovered something about electric cars in general. The whole process is silent. I couldn't hear anything. Is there some way to know the speed the wheels are spinning? Electric cars don't have a tachometer. This could be a problem that I've never thought about before.