In the late 90's/ early 2000 Diesel was about the same cost as regular gas and then at some point its about the same cost as premium gas. Is there any reason why Diesel costs more? I was always under the impression that it was a less-refined fuel therefore cheaper.
Supply and demand? Over here in Germany, Diesel was cheaper than (any kind of) gasoline for a long time, but that has also changed recently (Gemini says since Russia attacked Ukraine in 2022, so another thing to blame Putin for), now it's about 5% more expensive...
No. That's not correct. It got more expensive than gasoline since the attack on Iran.