Not sure the eGolf will save a TDI driver a lot in total cost of driving in a high electricity cost state. My calculation is that at 12,000 miles/year and $0.20/kWh for electric, the eGolf will cost $672/yer to power. A TDI at 50 MPG and $3.99/gallon for D2 (high, but probably not a bad number in SoCal) costs $957/year.
Then it starts to get fuzzy. You have to buy a charging setup for your house, so figure in that cost over the life of the car. But you may be able to charge off-peak at a lower cost. And if you can take advantage of free charging (at work, for example, or the airport) your power costs go way down. If you drive more than 12K/year the power cost difference increases, but if you drive less than that the fixed costs are higher per mile. And we won't even mention depreciation, which is pretty notoriously high for electrics.
My summary is that it may seem more economical if the electric suits your driving habits, but you're not going to get rich on the savings.
BTW, average price per kWh in Massachusetts is $0.22. Higher than a lot of CA. Thank goodness for Solar.