You don’t get 42 gallons of gasoline from a 42 gallon barrel of crude oil. That number is around 19 to 20 gallons of gasoline per barrel and around 11 gallons of diesel.
https://petroleumservicecompany.com/blog/oil-barrel-42-gallon-breakdown/
You also have 9% jet fuel and 15% other precursor fuel stock items along with1% lubricants.
This gets interesting with storage now that airlines reduced flights. There is very limited storage for jet fuel. I don’t think you can avoid making it when cracking a barrel so what do they do with it?