Range tests of any sort aren't easy, they take plenty of planning, and hardcore EVs fans are typically unhappy with the results.How do you figure out the exact dollar figure of gas used by the 308? What happens when the i3 dies and you need to have a generator on hand to charge it?
Without getting into too many of the details, since you can just watch the video, they drain the Ferrari of all fuel and only add $12 worth. For the i3, they check the remaining battery percentage, add $12 worth of electricity, and then drive the EV until it's back to the original percentage prior to the charging session. Not perfect, but more than good enough to prove a solid point here.
The Ferrari 308 runs out of gas after traveling only just over 28 kilometers, or about 18 miles. The i3 travels about 67 miles, though they estimate that it could have probably done about 80 without some disruptions to the testing. Keep in mind that the public charging was pricey, so if they had charged the BMW with $12 worth of electricity from home, the range would have come in at more like 160 miles or so.