How much oil was that plant producing in 1942?
I do not know and checked around for Italy. Pirelli had the plant.

Germany started in 1938 to push sythetic fuel production. In 1939 it produced 2.2 metric tons.
1940 - 3.3
1941 - 4.1
1942 - 4.9
1943 - 5.7 and than a decline after that.

Remember this was a Germany that used 600,000 horses for its army when it invaded the Soviet Union in 1941.

Standard Oil helped get this working back in 1938 with German industry.

Opps, the German figures are correct but the Italian synthetic plant was for rubber and for Pirelli to build it makes good sense.
roger that