Gas Buddy makes it easy to see how expensive gas is in your area as compared to elsewhere. We just moved from the only state that is entirely red, Connecticut, which thus has the highest prices in the contiguous US. This is in part due to pipeline and transportation costs but mostly because of the extremely high tax on gas there.
Diesel is now $5 a gallon in some parts of the country. Our second car is now en route via a car carrier. Most of the truckers doing the actual hauling are independents getting a flat rate for hauling a car and have to pay for diesel themselves. These high gas prices are killing them and their profit margins.