Hello, New energi owner (and I love it). I dont' get the charging though, some days I wake up and I have 28 miles other days I have 17, most of the time the regular 21. Is there something that influences this? Also, has anyone got the 240v charger? I'm contemplating getting one as I already have the hook ups for it and I find myself plugging in often only to need to leave again an hour later (which gives me next to no charge with the standard charger). Thanks!