The HCVA

[gherlt]

What petrol will cost is less clear, it might change to being a by product for the other uses of crude and therefore available "cheap" or maybe it becomes expensive due to limited crude production, limited refinery capacity and other uses than car fuel for it.

Crude oil will continue to be cheap (over supply and limited demand). Taxes (hydrocarbon tax, CO2-tax, VAT, ...) and distribution will make petrol expensive.