This is the battle between two of the cheapest electric vehicles you can buy today. The 2018 Nissan Leaf is all-new. It is a huge step up from the dorky styling and lame performance of the previous model Leaf. The 2018 Hyundai Ioniq Electric leads the way in terms of cost and efficiency. It also happens to be the most efficient EV for 2018. The EPA confirmed this EV utilizes just 25 kWh of electricity per 100 miles, enough to beat the BMW i3, Chevrolet Bolt, and the Volkswagen e-Golf.