I was using "Road Trip" app on my iPhone for a little while. I changed "fuel type" to "KWh", and you need to know the price per KWh or for the total cost of the session (most of our charging stations over here are free or tell you exactly how much the session cost you). It works if you are willing to take the time to log every charging session (I lost interest after a bit). I'm pretty sure you can export into Excel from the app, but I just use the average consumption from the app to calculate the per mile cost of my gas vehicles in a separate spreadsheet.
I caution you against using a Kill-a-watt meter. Mine lasted about a month before it caught fire (I do have a thread here on that), and there are many reports of similar issues with them for high power applications. They may be rated at 15 amps, but only for short periods of time. If you're drawing a high load for hours at a time, you may run into issues. Quality isn't there yet. They may not make any for 220V used where you are at. I do know of other people with meters installed into the home fuse box for the outlet being used to charge the bike, but those also cost several hundred dollars. And you can't take those with you when you travel.
