To what extent can speed management alleviate the range anxiety of EV?

Based on actual use data recorded by a volunteer driving an EV under the condition that the distance involved in his weekday commute to and from the workplace was almost equal to the catalogue travel mileage, both speed management and refraining from the use of auxiliary devices such as the heater are indicated as measures to alleviate the range anxiety of the EV. Firstly, to clarify the performance specifics, electricity consumption rate (ECR) when using the highway or public roads and when using auxiliary devices was calculated. Highway driving involved 1.4-1.9 times higher average speed and 1.2-1.3 times higher ECR when compared to driving on public roads. ECR when using the heater increased to 1.4 times the value when no auxiliary devices were used. The use of headlights, wiper, or air conditioning had a relatively small effect on ECR. On the basis of these results, the effect on actual vehicle range extension of reduction of cruising speeds on the highway was evaluated and speed reductions of 10 km/h from 100 to 90 and 20 from 100 to 80 gave 7% and 12% improvement in actual vehicle range, respectively. The effect of speed management on the ECR was smaller than the non-use of the heater but larger than the non-use of air conditioning.