Hi Paul,
1. Haven't noticed that at all!
2. I haven't noticed this either. It's the same speed as my previous car I'd say.
3. To prevent the engine starting, eg. First thing in the morning just to warm up. It doesn't stop it starting under normal conditions where it would anyway, like when you put your foot down. Not very useful I agree.
4. I've had it full bars a number of times, particularly after coming down long hills.
👍