Why is diesel more expensive than regular gas?

Diesel has become more expensive than regular gas primarily due to changes in air quality standards, increased demand, and higher taxes since 2004. These factors have driven up the cost of diesel, which is now often pricier despite historically being cheaper. This shift matters as it affects not just fuel prices but also transportation costs for industries that rely heavily on diesel. The article suggests that understanding these dynamics can help consumers and businesses navigate the evolving landscape of fuel costs.