I always recommend to people considering an electric car to work out the range they require, double it and that is the range they need when buying an electric car.
If you need a car that can do 40 miles a day, choose a car with a minimum claimed range of 80 miles. If you need a car that can do 50 miles a day, choose a car with a minimum claimed range of 100 miles. If you need a car that can do 100 miles a day... right now, forget it, but stay tuned for future developments.
The benefit of doing this calculation is simple: it means you never really have to worry about range for any of your driving. It also means you normally will have range 'in hand' for emergencies, or diversions or the odd extra short trip you just needed to do.
These 'rule of thumb' figures have been fairly consistently shown to be about right for every electric car that has come along. Nissan's figures show that 'worse case scenario' is approximately half the LA4 figures.