At 15,000 miles per year the cost to "fuel" each vehicle, according to the EPA's Fuel Economy web site are as fallows.
Prius $1,014
Pruis V $1,207
Nissan Leaf $612
Nissan Versa $1,811
Compare Side-by-Side
I included the Nissan Versa because it's the vehicle that the Leaf is based off of, so it's a fair 100% gasoline comparison, other whys you might as well compare a Ford F150 to a geo metro, they are different vehicles that are used for different uses and fill different roles.