LNG is highly polluting in practice because leaks are very common in LNG infrastructure.

https://www.npr.org/2022/02/03/1077392791/a-satellite-finds-...

Disclosure: I work for a company working on detecting these leaks. https://carbonmapper.org

To make up for the lower amount of tax collected on fuel sales, maybe.

Where I live (ireland), taxes on diesel are lower to the extent that it's cheaper than petrol. (done some time in the 80's, I think. To reduce fuel imports)

Since 2006 car tax is entirely based on CO2 output, previously it was engine displacement. Meaning EVs have €0 car tax. (you can tell, because you're required to display the tax-disc in the window and it says how much it cost on it.)

Yes, this has been a puzzlement for many of us here. It makes no sense.