[Koracan]

1950 to 1970::
1 gal crude = 10 cent
1 gal gas.... = 50 cent
Gain Ratio 5 : 1

Lately:
1 gal crude = 40 cent
1 gal gas.... = 400 cent
Gain Ratio 10 : 1

Lately, USA usage Gasoline::: 375 million gallons a Day
.. 1 500 000 000 $ Gas Income
..... 150 000 000 $ Oil cost
= 1,350,000,000 $ Gain daily

1960's usage:: 200 million gallons a day
..100 000 000 $ Gas Income
... 20 000 000 $ Oil cost
= 80 000 000 $ Gain daily

Actual $ Gain (today vs. 1960's) is = 15 : 1

All very approximate, purely comparing simple spread Oil vs. Gasoline

[thackney]

Are you under the impression the EPA and other government regulations have not added cost and extra processing since the 1950 for refineries?

There is little in common with a refinery from that time period to today. Even the oil is often different with far more heavy sour crude used that requires more processing.