In Summer, when I drive in the B-mode without A/C with max speed of 40-45 MPH, I am able to go 95 miles on a mostly flat roads. In Winter, it is adviced to time your battery charging to complete just before your trip as to keep the battery warm. Winter driving range is strongly affected by temperature, heater uses more energy as the temperature drops and battery provides less power. At temperature around -10C (14F), the range in B-mode at 40 MPH speeds with very modest heating is around 60-65 miles. If you ride on sun, it helps greatly even at these low temperatures.
The heating system can be easily upgraded to efficient diesel heating. Detailed instructions available at the following blog:http://myimiev.com/forum/viewtopic.php?f=14&t=1248