In single-write region accounts, the autoscale rate per 100 RU/s is 1.5 times the rate of standard (manual) provisioned throughput. Your bill shows the existing standard provisioned throughput meter. The quantity of this meter is multiplied by 1.5. For example, if the highest RU/s the system scaled to within an hour was 6,000 RU/s, you're billed 60 × 1.5 = 90 units of the meter for that hour.
In accounts that have multiple-write regions, the autoscale rate per 100 RU/s is the same as the rate for standard (manual) provisioned multiple-write region throughput. Your bill shows the existing multiple-write regions meter. Because the rates are the same, if you use autoscale, you see the same quantity as for standard throughput.