fuel

The natural gas itself tends to be more expensive and economically volatile.

Several groups said the EPA didn’t consider the role a number of other technologies could play — like hydrogen fuel cells, hybrids or cars that can use gas with higher amounts of ethanol.

There's about a 26-day supply available, putting diesel 20% below the five-year average supply.

The Environmental Protection Agency temporarily lifted a federal rule for fuel sales in four states in response to a fire last week at an Indiana oil refinery that could affect prices and supply.