I have a 50 mile round trip and am currently only charging at work as my home charger is a type1 tethered connection - £500 to change it to type2!
I find it best to stay in EV mode when I leave work until I hit motorway speeds, I then change to hybrid mode.
I make sure I've got a few bars of battery power when I get home so that I can pre-condition in the morning.
Then, going back to work, I do the same again but force it back to EV mode so that I utilise all the electric and have an empty battery when I get to work.
At weekends I don't generally touch the modes, I just let it sort out it's own mind.
Sometimes I'll use charge mode on the motorway though if I'm heading for a city so that I can EV while I'm there. Again, I might use charge mode to give me a few bars to pre-condition on Monday morning