I currently have a 2017 i3 REX... bought it in Sept 2021, it had 36K mi on it.. paid $22K for it.
FWIW, I've owned a 2012 Plug-in-Prius, a 2014 Volt, a 2017 Bolt and a 2021 Model Y. We currently have a 2021 Model 3 along with the i3 REX.
I bought my i3 as a "holdover" car to use between when I sold my Model Y in Sept 2021 and whenever my Rivian R1T gets delivered (which is now scheduled for Q4 2022) as my occasional (I work mostly from home, but go in once/month or so) 50 mi round trip to work and local running around car. I liked the idea of the REX because I had that in my Volt and it worked out great, no range anxiety whatsoever.
In 2017 BMW increased the battery capacity of the i3, I get about 110mi EV range, then another 70+mi out of the REX. BMW increased the battery capacity again in 2018, so you have three different battery sizes in the i3's... 2014-2016 = 60aH, 2017 = 94aH, 2018-2022 = 120aH. The REX size never changed, but in 2017 they enabled the full capacity of the 2.5gal fuel tank to be used where it was software limited to 2.0gal in earlier i3's.
As another poster noted, i3's before 2017 had 3G modems and have lost app connectivity since Feb 2022, my 2017 i3 has a 4G modem and the phone app (for conditioning, car locator, door locks, etc..) still works perfectly.
Since purchasing in in Sept of last year I've put about 2.5K mi on the i3, and it's actually been flawless for me. The longest trip I took in it so far has been about 95mi round trip, I could have made it on all electric, but I did some programming in Bimmer Code to let me turn on the REX at any time as long as the battery is below 75% so I was able to use it early on that trip and I came home with 50+mi left on the battery.
The interior is a breath of fresh air design wise, the car is small on the outside but large, open, bright and airy with great visibility on the inside. I find the seats very comfortable, much more comfortable then the Chevy Bolt seats that gave me leg pain issues. Everyone who's driven in my i3 has commented on how inviting and warm the interior is... it's just a nice environment overall.
My i3 has the 19" wheels, and AFAIK there is only one manufacturer that makes tires for that car. I would advise anyone who has an i3 to buy a used wheel on ebay, etc.. and put a new tire on it and keep it handy as a spare, because nobody keeps these tires in stock, not even BMW. You can get them from tirerack.com at a reasonable price.
As of last month when gas hit $5/gallon here I have officially handed my i3 over to my daughter for her daily 51mi round trip work commute. She comes from a Mazda CX-3.. She loves the i3, thinks it's much nicer than the Mazda and is super happy to be driving for free (my rooftop solar pays for all our electricity). She usually comes home with 50% left on the battery, and now that it's getting warmer she made it a full two days commute (104mi) without recharging or the REX firing up at the end of the second day. Nice thing is, with the REX, she can game it as she likes to see how much she can get out of the battery but not worry about being stranded like she would be without the REX backup.
All in all, the i3 has been a really great little commuter, run-around car for us, other than the lack of choice on replacement tires.. I only have good things to say about it!
When my Rivian finally comes late this year (hopefully) we have decided to keep the i3 in the family and sell the 2019 Mazda CX-3. It's a perfect commuter car for my daughter, it's in great condition, costs her nothing to drive and should last for a very, very long time with the carbon fiber frame.
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