Hi JeffRay:
Thanks for the welcome. We own a 2017 B250e we just got Nov last year. It was used with only 20K miles and according to the non-Mercedes dealer, still under bumper to bumper warranty for another ~2 yrs, as well as a 100K mile battery warranty. At $17K USD it seemed like quite a steal. It was very easy (and amusing) making the dealer remove over $2K in maintenance fees on the invoice, since they could not justify them with the typical "Oil /fluid/filter changes" while pointing out the tires and brake pads were obviously not new. We did take it to the local MB dealer immediately after purchase and complained about the range jumping around a lot, but we are not sure what they did, if anything.
It is my wife's car, so I was hoping for a handy way to estimate when the car will be fully charged. I have no problem mentally calculating Kwh over time and how long it would take depending on the charger's capacity, yet that is not something she is inclined to do. I did find the tip about using the E-Cell display after plugging in to approximate the time it would be charged. That is handy, assuming it is fairly accurate. I'm just a bit confused why pressing the Range Extender button adds another 30 minutes to the time displayed, even when it is fully charged. I have not tested how accurate the time estimate is, but I'll do it soon. In researching this, I found something I may try soon: Iotawatt. It is a lot better than "Sense" or other highly publicized monitoring. Part of the motivation is that we also have solar panels and Tesla/Solarcity monitoring leaves a lot to be desired.
As our first EV, we did experience range anxiety for the first month or so, but it has slowly ebbed to a minimum now. The best thing I did to overcome it was installing a NEMA 14-50 right next to our breaker panel in the garage and buying a 40 Amp charger cable. The plug was a DIY project for under $100. It was surprisingly difficult to find the maximum charging rate this car is capable of doing. Once I found out it was 40 Amps or 9.6 Kw, then it became clear what I needed to install. I ended up getting a MustStart cable as the least expensive 40A L2 charger I could find. There is a lot of criticism online about this car not having fast DC charging capability, but on paper, 40 Amps will charge the 28Kw battery from 0% to 100% charge in just under 3 hrs. In our experience, the car usually starts with more than 60% charge and 100% charging usually takes less than 1 hr. That rivals DC charging rates, without potential damage to the battery.
At this point we are very happy with this car and the whole EV experience so far. On the long term, I'm looking for some way to be able to emergency roadside charge the car if it runs out of battery on the road sometime, using a portable AC generator (gasoline) of some sort, but considering that there are public chargers all over DFW, and we drive almost exclusively in the city, it is fairly unlikely. At this point I'm more concerned about getting a flat since it doesn't have any spare tire. I also need to look a bit more carefully at the warranties we supposedly have, since there do seem to be some things that fail on this car prematurely.
One observation I got from a fellow EV driver at work, was the incredible power consumption of windshield wipers. On our B250e, you can literally see the miles drop off with every swish. Maybe using some sort of Teflon or lubing liquid to reduce the blades' drag on the windshield will reduce its power draw substantially, as it's electric motor has to work a bit less. That is just an idea I have yet to try.
I may likely inherit this car for my commute, having her move into a larger car (which I hope is an EV). Hopefully EV SUVs will soon become commonplace and there are some good choices out there. We can't afford anything new from MB or any luxury car makers for that mater, so I have my fingers crossed.