Makes sense. I've dug around a little more about this, several sources has the 120v charger sipping 6Kwh for 18 hours to charge this beastie up to give 140 km range give or take.
Off peak is 6.2 cents per Kwh in Ontario, so 6*6.2*18 = 6.70 plus HST per charge, call it give or take 7 bucks.
Your average econobox these days will do about 7L/100km, so let's say about 10 litres to 140 km, or about 12 bucks based on todays roughly $1.20 per litre in SW Ontario; so about $5 more to go the same distance.
Based on $5 per 140km energy/drive cost and a roughly $10k difference in purchase price, you'd have to drive a Leaf just over 280,000 km to derrive any financial benefit, probably marginally lower
considering an electric motor has lesser maintenance requirements, so call it about 250,000 km in annoyingly short 140 km bursts before the 18 hour charge on 120v. The 220v charger will cut down the charging time and will consume relatively less Kwh, but the math will be similar over the long haul.
The environmental impact of generating electricity vs. refining crude to gasoline and then burning it is arguably similar. Bottom line remains, I still don't see any benefit be it cost, performance or environmental.