I use the heating on 3/4 bars at 23 degrees. When my windscreen is steamed up I use mac without a/c and it takes ages to clear up.
I charge the battery once a week and save it when I go town driving. My battery would show 11 miles but it’s completely empties when I do a 3 mile trip. It’s really bad.
when I do town driving without electric I get 15-22mpg. This is on comfort mode.
another thing I’ve been trying to do is drive fast to get to 30 and then my foot off and try to drive on electric. The problem is the speed drops and drivers behind me overtake me.
The one thing we should start with is that the MB battery performance is heavily impacted by the outside temperature.
I did a 5.4 mile trip on Saturday and only had 25% battery remaining at the end. That trip was in e-mode, because I knew the car should be able to do it without the engine on. It included some sub-30mph pottering for roughly a mile uphill, which used about 20% of the battery, an uphill acceleration to 60mph that used about 15%, a downhill cruise that gave me 2% battery back and a brief sub-30mph section that used a few % then the opposite journey to return home.
There’s a good chance the same journey in hybrid would have not used the engine either. If you’re 100% confident your car can’t do this, there might well be a problem with the battery.