As stated in the previous post, with sadness, I have sent my 2012 Chevy Volt to greener pastures and have decided to do my first ever lease on a BMW i3 with Range Extender. I only have 500 miles now on my BMW, so I can't do a proper review, but from what I have seen, my review will be better than what is currently out there...
I am not going to compare the range extender. Not at this time. One of the benefits of a car with 80 miles of electric range is that you are not going to need it very often. I managed 93% of my driving to be electric with the Chevy Volt, with the assistance of public L2 charging, and I expect that number to be closer to 98% with the BMW i3.
What I am going to compare are the differentiators between the two. I'll let you assign a value to these...
Cool features the Volt just doesn't have...1) Stop and Go Adaptive Cruise Control: This feature is the one that made the difference for me. In short, once on the highway, the car will follow the car ahead of you, adapt to their speed at a configurable following distance, all the way down to 0 miles an hour. Then the car will continue to follow them when they start moving again. I commute 1 hour each way to work, often in bumper to bumper traffic. In the 4 days I have used this, it has worked very well. I take my foot off the accelerator and just steer the car. It isn't the Tesla Auto Pilot, but it isn't too far away from it, either.
2) Automated parallel parking: It is a nice feature to have, and seems to work well. In the three instances I have tried to use it, it parked the car effortlessly without me touching anything.
3) Rain Sensing Wipers: I like not having to touch the windshield wipers and adjust them for the constantly changing amount of rainfall.
4) Collision Avoidance: Active braking to avoid collisions with vehicles that you are about to run into
5) Detailed sensor display during parking: Really nice. Will actually show you a picture of your car on the screen, and show active feedback to where sensors detect obstacles. The backup camera, by the way, is the best I have seen.
6) Advanced GPS routing to maximize your electric range (ECO Pro routing)
7) LED Headlamps: Finally happy to have properly bright, but low energy, LED headlamps.
8) Automatically folding side mirrors: I use this, often. When I park, I press a button, and the mirrors fold in. One less thing to get knocked off.
9) Better basic warranty: 4 year/50k miles versus 3 year/36k on the Volt.
10) Automated preconditioning: You tell the car your departure times, and it makes sure the car is warm... NOT the same as the Volt, where preconditioning is a manual process done through the app (no scheduling)
11) Totally lay flat rear seats: Great for Cargo. The Volts seats do not lay entirely flat, and the middle cup holders are still exposed.
12) 7+ kW charging: Makes the most of your charging. The Volt, even the second generation model still only has a 3.3 kW charger.
13) DC Quick Charge: Probably will never be available on the Volt, as the car is intended as a mix mode vehicle.
Cool features the Volt has, that the BMW does not...1) Auto locking doors: When you walk away from your Volt with the keys in your pocket, the car automatically locks. I can tell you that I have been leaving my i3 unlocked a LOT because of the lack of the feature that they should support (they have proximity unlocking)
2) Remote unlocking of doors: BMW only allows you to lock, but not unlock your doors with the app. A huge fail, and poor decision.
3) Charge completed txt notification: BMW does not have an option to notify you when you car has completed charging. Another big swing and a miss, when plug sharing is very common. I cycle my car out as soon as the charging is done. With the BMW, I have to load the app, and routinely update the status to see how much longer I have.
4) Lane Departure Warning: Beeps if it senses you are tracking out of your lane
So, you can see that the BMW has a lot more offerings on the i3 than the Volt by just looking at features. If you look at performance, the i3 will also win. The Volt should hold more cargo. As to rear passenger comfort, this could be a toss-up, even though there is a lot more head room for passengers in the i3, and what I also to believe is a little more legroom. I also think that the i3 interior, with the Terra trim level, is vastly superior to the interior fit and finish of the Volt. I always thought the Volt relied too much on plastic for a 40k car.
In conclusion, the BMW i3 is a more expensive car for a reason. It has a lot more features. But the Volt could still be the car for you if you find yourself using the gas engine a lot, or don't value the features listed above and their associated premiums. Also, I don't think I would trust the i3 range extender for long distances. The Volt clearly has it beat in that area.