He reckons that ride-hailing services add 2.8 vehicle miles of driving in those cities for every mile they subtract.

他认为，在这些城市中，它们的行程每缩减一公里，约车就要多跑2.8公里。

What they don't say is you're going to get a lot more vehicle miles.

他们没有说的是您将获得更多的车辆行驶里程。

Vehicle miles traveled: that's what I was just talking about.

车辆行驶里程：这就是我刚才所说的。