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I’m also suffering from poor range. Based in the UK with temps around 5-10c, I cannot get above 1.5m/kw. On a full charge car is showing I have 175 miles but only manage to get 120-130 out of it. I have a car with 22” wheels and full tech pack. Mostly drive in B mode in the city. This range does not make sense. My i3s was much better. i just got the car back from service after a recall update. I asked BMW to check the car. They claim nothing wrong with the car and suggested I pre condition the car every morning. After speaking directly to the technician, he told me that he has noticed that the m40’s drain a lot faster than the m50’s but can’t work out why. Anyone else getting really poor range?
Your numbers are very similar to mine. I got the car in Jan, and it's been steadily cold here in Latvia all that time (from -10 to +3 degrees C), with lots of snow. My current average is 38kWh/100km, which is about 1.6miles per kWh. Waiting for the spring to finally arrive here to see if warmer temp makes any difference.
 

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Just picked up my ix40 on Monday. Did a 29 mile drive today, and struggled to achieve 2.6 miles per kWh.

That's in efficient mode, sometimes using B, sometimes D with adaptive regen. Local roads so between 20-45mph with some stop start traffic. It was raining and about 14C (57F) outside. I had climate on with heated seats.

I've got the 22 inch wheels. Do these cars need to settle in first before they find their efficiency? Is constant cruising at motorway speeds where they are most efficient then?

Based upon this first journey, range would be 185 miles and it's not even depths of winter yet!
Wondering what you’re usage is looking like these days?
 
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