Artificially reducing supply by whatever means is going to have a similar effect on the consumer as a tax, prices and the cost to the consumer will rise
Reducing the supply has the effect of not taxing your own citizens more than the rest of the world. Also, a tax at the gas pump hits the everyday Joe (or in Norway, Mittias) disproportionately. Lots of fuel is consumed without ever going to a gas station.
It has the effect of increasing the price, just like a tax