Robert Bonomi wrote:
...

Automobile usage is a small part of total fuel consumption. like 1/5 or less.
of vehicular use. well under 10% of all petroleum consumption, when you
include oil-fired heating, farm implement, and marine use.


Moreover fuel does not account for all the petroleum used. Petroleum
is the single most important feedstock for organic chemicals like
virtually all synthetic fabrics, plastics and solvents.

Your arithmetic is quite sobering.

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FF