3. 里程

????對于電動汽車來說，最重要的莫過于一次充電的續航里程，不過儀表盤上的續航里程跟我們在真實世界里跑出的里程通常不可能完全一致。特斯拉表示，憑借Model S超牛的電池，它可以一次性跑300英里。不過專業汽車網站Edmunds.com的一位試駕員卻表示，他在跑了121英里之后，儀表盤上的里程就顯示他已經跑了251英里，讓他在之后的回家路上有些惴惴不安。

????寶馬表示，用戶可以選擇在i3上安裝一個像摩托車引擎一樣的汽油增程發動機，從而可以讓這款車型再多跑186英里，以避免車子因為沒電了而尷尬地在路上“罷工”。另外據說i3一次充電后就可以跑93英里。但是在這款車型最終上市以前，一切都還不能肯定。

????優勢方：平手

4. 緩解“里程焦慮癥”

????特斯拉將在加州和東北各州以外擴展它的快速充電站網絡，預計等到這個項目結束時，全美將有大約200個快速充電站。另外特斯拉還在今年六月展示了它的換電池技術。通過兩輛Model S的演示可以發現，它們換電池的速度比普通汽車在加油站加油差不多要快兩倍，而且無需司機下車。

????寶馬i3上的一塊顯示屏可以顯示附近充電站的位置，同時寶馬也會在某些地區提供道路救援服務。不過這種道路救援服務并不是拖車服務，而是先給你充一定量的電，使你的i3有足夠的電量趕到下一個充電站。

????優勢方：特斯拉

5. 技術

????特斯拉最大的技術成就就是它成功地無縫整合了該車的所有部件，尤其是那個由7,000塊小電池組成的動力系統。同時它邁出了不同尋常的一步，就是自行制造汽車元件，比如鋁合金車身面板和塑料件等，而不是像其他廠商那樣從外部采購。

????寶馬在研發上同樣不惜血本。寶馬i3采用了鋁合金底盤，而轎廂部分則大部分應用了輕量的碳纖維材料，這也是量產車第一次采用這種技術。因此寶馬表示，這臺四門電動汽車的重量只有2800磅左右，比雪佛蘭沃藍達（Chevrolet Volt）輕了大約1000磅。

????優勢方：平手

3. Range

????In electric cars, what counts is how far you can go on a single charge, and the range numbers that are displayed on the instrument panel usually can't be duplicated in the real world. Tesla says the Model S can travel up to 300 with a beefy battery. But an Edmunds.com tester discovered he burned up 251 miles of indicated range after covering just 121 miles, which made his ride home a bit uncomfortable.

????The i3 will have an optional range extender, a motorcycle-like gasoline engine that can power the car for 186 miles, BMW says, which should prevent embarrassing roadside breakdowns. Otherwise, the car is said to be able to travel about half that distance, 93 miles, on a single charge. But we won't know for sure until the cars are actually on the road.

????Advantage: tie

4. Range anxiety reduction

????Tesla will expand its network of fast-charge stations beyond California and the Northeastern states and expects to have about 200 charging stations nationwide when it is completed. In addition, at a demonstration of its battery swap technology in June, Tesla showed two Model S sedans having newly recharged batteries installed twice as fast as they could get filled up at a gas pump and without the driver getting out of the vehicle.

????A display in the BMW i3 will show the location of nearby recharging stations and will also offer a roadside assistance program in some areas. The assistance vehicle will provide a jolt rather than a tow, so the i3 can scoot on to the next charging station.

????Advantage: Tesla

5. Technology

????The greatest technological achievement of Tesla has been its ability to successfully integrate all the components of the car, especially its 7,000-cell battery power system, without a glitch. At the same time, it has taken the unusual step of making in-house components that automakers usually outsource, like aluminum body panels and plastic pieces.

????BMW is no slouch either in R&D. The chassis of the i3 is made of aluminum while the passenger compartment is formed largely of lightweight carbon fiber, a first for a mass-production car. As a result, BMW says the four-passenger car only weighs 2,800 pounds, about 1,000 fewer pounds than a Chevrolet Volt.

????Advantage: tie