If you take a look at your CW report for April, you might find that it matches your “dash” (behind the wheel-right?) average.dgpcolorado wrote:April mileage:
Wall-to-wheels: 4.0 miles/kWh
Dash: 4.6 miles/kWh
Charging efficiency at 240 V, 16 A: ~84% (included some charges to 100%, which are less efficient than charging to 80% or less)
As the weather warms, and April was unseasonably warm and dry here, my miles/kWh continues to increase. I'm curious as to what sort of numbers I will get in summer. I'll never get the numbers that the mild-weather flatlanders get, but I think I might get as high as 5.0 on the dash...
If you also recorded a monthly m/kWh report from the nav screen, it might be more accurate, as both the dash and CW may be under-reporting m/kWh by the same 2.5%. (due to the same odometer error?)
Below are my CW averages since delivery, from the “Regional Rankings” page.
Your rank for the past 12 months
Month and Year Grade Rank Energy Economy
May/2011 Gold 492 5.4 miles/kWh*
Jun/2011 Gold 695 5.7 miles/kWh*
Jul/2011 Gold 1651 5.3 miles/kWh*
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 2992 4.5 miles/kWh
May, June an July 2011 not comparable, since these are from before I had the CW update done, at the beginning of August.*
Everyone’s annual m/kWh curve will look somewhat different, for various climates, and as they modify their driving, charging, and climate control use, seasonally.
I doubt I’ll ever get much outside of the 4.0-4-5 range though (at least until DC charging comes to I-5, allowing me to add a lot of high-speed, and low m/kWh, freeway miles).
I may even begin to see a smaller dip in efficiency show up in midsummer, as I do most of my driving in the Northern Sacramento valley, where daily temperatures are frequently over 100 F, and AC use is significant.