Zipcar has had challenges in the us - a low utilisation rate caused by low population density and vehicle dislocation [sending someone to retrieve the car is a problem].

在美国，在线汽车租赁遇到了很大的挑战，低人口密度和低机动车复位率(没有人将那些使用过的汽车归回原位)导致网站利用率很低。

youdao

The utilisation rate should rise over the lifetime of the contracts.

ECONOMIST: The threat of competition is what matters

Time was that whenever the American utilisation rate went over 70% (as it is now), the return on sales of the big three car firms was at least 8%.

ECONOMIST: Global pile-up