Update:
Below are my CW monthly averages since delivery, from the “Regional Rankings” page.
While the month–to-month variations are largely explicable by variations in my driving patterns, the overall energy efficiency increase reported over time is not.
As you can see, my average increase in reported efficiency is probably pretty close to 20% year-over-year. In fact, while I drive to the same destinations as I did in 2011, I have altered my driving patterns significantly, but I’m sure all of you realize what it would take to produce an efficiency increase of this magnitude, which IMO, is far greater than can be explained by the changes in my driving patterns.
I believe this further reinforces my range test results, indicating a significant error in my LEAFs m/kWh reports, under-reporting my LEAF’s energy use by up to 10% over the Summer of 2012 as compared to my LEAFs energy use reports over the Summer of 2011, as reported at:
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In other words, I think it most likely that up to half of the efficiency increase reported below is actually due to MY LEAF's inaccurate reports of the actual Wh content of each kWh in every report, with the actual Wh content of each "kWh" increasing over time.
I believe this kWh report error is what Nissan has disingenuously referred to as “gauge error”.
Month and Year Grade Rank Energy Economy
*Jun/2011 Gold 695 5.7 miles/kWh
*Jul/2011 Gold 1651 5.3 miles/kWh
*May, June and July 2011 are not comparable, since these are from before I had the CW update done, at the beginning of August, after which all CW m/kWh reports have precisely matched my dash m/kWh reports, over the same interval.
Aug/2011 Bronze 3622 4.2 miles/kWh
Sep/2011 Silver 3457 4.5 miles/kWh
Oct/2011 Silver 3640 4.2 miles/kWh
Nov/2011 Gold 2792 4.2 miles/kWh
Dec/2011 Gold 2827 4.0 miles/kWh
Jan/2012 Gold 2547 4.2 miles/kWh
Feb/2012 Gold 2354 4.4 miles/kWh
Mar/2012 Gold 2975 4.3 miles/kWh
Apr/2012 Gold 3018 4.5 miles/kWh
May/2012 Gold 1978 5.1 miles/kWh
MY LEAFs TCU failed in early August 2012, before I copied June and July results, which Nissan later sent to my in an excel file:
June 2012 5.0 m/kWh
July 2012 5.0 m/kWh
And since then, CW reports have resumed, giving the following results:
Aug/2012 Platinum 1237 5.7 miles/kWh
Sep/2012 Platinum 1527 5.5 miles/kWh
Oct/2012 Platinum 1368 5.3 miles/kWh
Nov/2012 Platinum 1996 4.7 miles/kWh
Dec/2012 Platinum 1314 4.8 miles/kWh
Jan/2013 Platinum 1240 4.8 miles/kWh
Feb/2013 Platinum 875 5.2 miles/kWh
Mar/2013 Platinum 893 5.5 miles/kWh (will edit later with the full month data)