Well, it's definitely heating up around here. Average temperatures have nearly broken the 60-degree barrier. Time to break out the cargo shorts. Just over 4000 miles on the Leaf and no issues to report. Deliveries of the Leaf are starting to heat up as well.
So why have I made three references to temperature? Look at the right-hand column in the table. I started tracking mean monthly temperature. With only four data points, it's not statistically rigorous, but there appears to be an linear relationship between MPGe and temperature, with a coefficient of 2.25 (ie Multiply temperature by 2.25 to get MPGe). Check back here in July and August to see if it holds.