The average U.S. price for gasoline rises to an all-time high above $4.00 a gallon, following the spike in crude oil futures, with some analysts saying speculation may be the culprit. See full story.

Weekend Edition: Saudi Arabia plans royal treatment for heavy crude

Dense, dirty and less profitable, a type of crude oil long marginalized by the global petroleum industry is attracting a wave of new refining investment as supplies of premium crude look set to decline. See full story.