I don't think so. Newbie syndrome possibly at play, fast starts ala Tesla which has a bigger battery and longer range. With the short legged B250e, you get max range if you treat it gently. Try driving in E+ mode with gentle starts and regen braking. Your GOM range will increase. For definition of GOM, search the forum which will lead to topics that elucidate more range stories than I wrote.
Also, this car has a Tesla battery and motor so battery degradation is comparable to Tesla, i.e. not too bad. MB has your car's annual battery evaluation, ask them.
Also, depends on your driving environment. Urban stop and go vs. highway. What is your average outside temperature?
Jeff in NYC
MB '17 B250e; MB '06 E500W; MB '81 380SL