you can always join Lewis in Monacco, petrol duty will still apply though,
I've no problem with duty+vat - fuel is so important to the economy and transport infrastructure required to go with it needs financing.
if you just applied a single super-vat at point of sale you'd probably have some fraud, versus securely applying duty as the fuel is delivered from the few companies who can actually make it, equally having a vat, too, similar to other products just makes it easy to administer at pos.
with the refinery capacity that reduced closure/mothballing during covid , not sure we have any data to show, supply from refineries is being limited, they are probably the bottleneck,
similarly for the gpu chips the fab capacity was reduced courtesy of covid, they were temporarily closed.