Any data on how much juice you used and overall cost in that time? Knowing that electricity was often free it would be interesting.
That's quite simple, as my electricy bill went up on average +30CHF (31.5EUR, 34USD, 27GBP) per month since I've had the Twizy.
So: 10000km done in 4.5 months = 2222km per month, at 30CHF = 74km per 1CHF = 148km/L (at currently 2CHF/L of 95)= 0.67L/100km! (351mpg US, 421mpg UK)!
Granted, in reality it's probably a tic more because (as you mentioned) I do occasionally charge the Twizy for free in the field, but I do that very rarely now, as all the places and people I regularly visit are all inside a 1-charge loop from my home. - Same goes for the (many) just-for-fun drives I do at evenings and weekends, they are all inside the max loop range of the Twizy, which is reduced from a possible 90km to about 70km because of my preferred "go-go-go" leadfoot driving style.
The conclusion is clear: It's simply incredibly cheap motoring!