Impact of Winter Driving on Energy Economy
Here is a chart. It was generated by the CarWings web interface (which is a web data acquisition and reporting site that comes with your Leaf. It's the back end of the Leaf's data reporting architecture.) I mention CarWings because I know there are people with more expertise about the various ways one can measure Energy Economy with an electric car. I'm not yet smart enough to wade into that discussion. But I can use a web site to generate a chart.
And like I said, here is a chart.
The bars represent miles driven by month. And the line represents energy economy in miles/kWh per month. One thing to note at first is that in October we took a very long trip in the Leaf which I have yet to write about here. That explains the one large bar compared with other months. I should also point out that I combined two charts to make this one since CarWings only reports by day, month or calendar year. So if you see some odd graphic aberrations, that can be attributed to my Photoshop skills and being in a hurry.
The main story, coming on the heels of my last post is that winter cold weather driving does significantly affect energy economy. Prior to October, I was holding a solid mid 4 miles/kWh average. Something line a 4.5 or 6. In fact as you can see, I didn't have a month below 4 until December. But since then I've only managed to stay in the 3's and I've seen my rolling average since ownership go from a 4.5 to a 4.0. I am working hard to keep my daily averages near a 4 to try to prevent my overall from dipping into the 3s. I know, it's a silly game with myself, but it is a game in the service of energy efficiency so I can live with that.
I am interested to see where I end up in June as I come around to one full year of ownership. My goal of course is to keep things above 4, but the longer I go the harder it is to affect that number either way. I will provide an update here at the end of June. Until then, I'm keeping the heater off as much as I can and watching my driving habits.