I think he's saying that historically US per capita income (there's no such thing as per capita GDP) is/was higher than in other countries because more gasoline per capita is/was used to obtain it.. And I think he's right.

There is no necessary link to taxation, even though it can be implied.

I don't quite understand what your saying. Cheap gasoline is a major economic stimulant or better intoxicant. Subsidized gasoline combined with higher worldwide prices is one of the major factors in WestTexas export land model. The US is something of a hybrid since it is both a large producer and importer so it or at least parts of the US benefit from high prices. In some ways its better to think of Texas and Louisiana and Alaska as an exporter country to the rest of the US. But since "exporter" wealth tends to simply concentrate its not a strong driver of overall GDP in the US unlike a true exporting country with a National Oil company.

So either I don't agree with your statement or better don't understand it. Cheaper gasoline esp imports tends to increase GDP IMHO. In general the cheaper commodities are the higher the GDP since most of the GDP is in value add not bringing commodities to market.

Norway is unique since its a net exporter with high gasoline taxes. In effect the taxes vs income from exports probably leads to a low effective cost for Norway I don't think you have treated Norway correctly since they make quite a bit off their oil exports.

Denmark I simply don't know.

And the Swiss are well ... Swiss :)