The automakers will report April vehicle sales on Tuesday, May 1st.
Note: There were 24 selling days in April 2018, down from 26 in April 2017.
From WardsAuto: U.S. Light-Vehicle Forecast: April Sets Stage for Strong Q2
The Wards Intelligence forecast calls for U.S. automakers to deliver 1.35 million light vehicles in April. … The report puts the seasonally adjusted annual rate of sales for the month at 17.1 million units, below last month’s 17.4 million but slightly above year-ago’s 17.0
emphasis added
It appears April will be another solid month. So far sales in 2018 are running at about the same rate as in 2017.