If my math is correct once diesel gets to be >$1.50 spread with Regular, the monetary advantage is no longer obvious, we should remember a tiny amount added for DEF. What remains confusing to me why Diesel is so high, it must be artificial as it is more available, cheaper to manufacture, so it cannot be a production cost or even extra taxes. Perhaps, the profiteering is going on to take advantage of the "COVID special situation" as demand for delivered good is at all time high? Diesel is a fantastic engine and these artificial prices are driving these great GM trucks into extinction, general thinking is that electric would eclipse diesel... I tried BEV vehicles several times and really wanted to make them work. They do not at least those that are in my price range. I need 550 miles of range.