It is one of those questions where the answer is 'it depends'.
Lots of factors to take into account, like weather, temperature, type of road (Motorway, back road), how you drive it etc
As a rule of thumb, its 30 miles range driving at 50mph, and 50 miles of range driving at 30mph.
I have a 32 mile round trip, mix of back roads, A roads and motorway. In the Winter I arrive home with 0-1 mile range, in Summer can be up to 10 miles.
Although this is the standard Twizy and not the 45, I don't know the percentage difference on that