After the Volts arrive at dealerships, a technician performs a road test of about 25 miles to test the all-electric mode and range extending mode on a variety of road types. After the on-road tests, they give the car a "bumper-to-bumper" inspection, checking things like fit and finish, GPS, accessories, as well as charging from 120 volt and 240 volt sources. The only Volts that won't be checked are those that were randomly chosen for extended testing at the factory. In that case, the Volts will arrive at the dealership with as much as 70 miles on the odometer. This is one case where having a few extra miles on the odometer is a good thing.
[Source: Green Car Congress]