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FWIW, here is a sample week of charging from my car. Second column is data from EVSE, as reported from mychargepoint.net (Coulomb program, it gathers data as part of DOE grant that subsidized the EVSE). Third column is from spreadsheet downloaded from myvolt.com (which didn't exist for most of the year, started working more recently, but with sporadic missing data, dropped days). Fourth column is charge time.

8/27 4.254 4.17 1:22
8/28 3.209 3.14 1:03
8/29 4.384 4.30 1:22
8/30 7.604 7.46 2:23
9/1 11.115 10.92 3:26
9/2 4.836 4.74 1:33

So Onstar is reporting about 2% less than Coulomb, how they measure I have no idea.

Unfortunately I don't have any data for 120v charging. I took measurements my first month of ownership last September when I was using 120v, but my Kill-a-watt fried itself after a month of usage, and I didn't bother getting another one. Onstar didn't have kw-hr data available back then. I was getting between high 12.x and 13.5 kw-hr on a full charge, so roughly between 20-25% charging losses, depending on how hot it got and how much the cooling fans had to run.
 

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Electric Economy

I was getting a check engine light code (P0D22?) that had to do with cold weather start up. It really didn't cause any problems other than the CEL coming on when the outside temperature was low. GM developed a software patch which I had uploaded last week. The car seems to be performing great but the ONSTAR site has the car using 85 to 99 kW hr per 100 miles when before it was around 30. Should I be worried?
 

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Discussion Starter · #23 ·
Don't worry. The data on onstar is quite unreliable, often missing charge events. And likely the software update threw some parameters off.

To be sure, just check the miles you get on a charge. Or after a drive, press the leaf-button to get the kWh used and EV miles driven. Divide EV miles by kWh used, which gives you the true electric economy number. You should get something around 3.6 miles/kWh (between 3.0 in winter, possibly 4.5 in summer).
 
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