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I find the Rex to be the only thing that prevents extreme anxiety every time I go more than 10 or 15 miles in a day in the i3. My 14 Rex typically shows about 60 e-miles in the summer but only about 40 in the winter, and with the heat on and if I drive the slightest bit aggressively (which I tend to do a lot), that winter e-range quickly drops to 25 or less. Yes it's a 10 year old car and the HV battery has obviously degraded some, but even on short trips, I often find the e-range down to single digits by the time I get home. With the Rex, I just don't care.  So what if I need to put half a gallon in it the next day? Without the Rex, I would never be able to stand the stress of wondering when I'll be stranded with zero charge. Just my own experience.