The official ranges are now tested under new WLTP tests, which are intended to be more reflective of real-world driving. That said, it's still normal to find the range in the real world isn't quite as much as those quoted by manufacturers. During my time with a Volkswagen e-Golf (www.honestjohn.co.uk/our-cars/volkswagen-e-golf/), I found that electrical devices such as the radio had a negligible effect on the range. However, it wouldn't travel as far in winter, when things like the lights and heater were all in use. Incidentally, heated seats are generally more efficient than heaters - so bear that in mind when speccing your new electric car!