Hello,
I am new to the site. I have only been using diesel fuel for three years now, but had the same curiosity regarding price.
I could be paranoid.
Taxes are not established by themselves.
Supply has been manipulated by the Seven Sisters for a century and the auto makers help create demand by the choices of production, limiting fuel economy and energy type, for examples.
GM owned the proprietary rights to the process which put lead into gasoline, hence the oil industry auto industry direct connection. They GM received a royalty for every gallon poured! They called for and manipulated the hearings, but ultimately agreed to phase out lead (stop putting it in to counteract pinging/knocking).
OPEC is like the wizard of oz to me. People that can't grow their own food don't run the world.
This is all conjecture, of course.
Diesel is more efficient and costs less to produce.
If the cost is lower, the energy density greater and fuel economy greater, and the diesel engine lasts longer, then every vehicle owner would opt for diesel.
That would equal less profits for both automobile manufacturers and for oil companies.
That is not allowed here.
Mitchellray