So many choices for gasoline.

[runnerhiker]

Re diesel and current price for it.

When we were young and diesel was cheap, it had 500 ppm of sulfur. When catalytic converters were installed in cars, the sulfur content of gasoline had to be lowered to around 5ppm (I don't remember, that was in the late '80's) to protect the catalyst in the converters. Around 1995, the sulfur content of highway diesel had to be lowered to 5 ppm also, it was labeled LSD (low sulfur diesel). Sulfur makes SOx which makes smog. At the time, farm equipment diesel was still 500 ppm sulfur and it was called HSD (high sulfur diesel).

The process in a refinery to remove sulfur is expensive, it requires the use of catalysts, high pressure (up to 2000 psi), and then the sulfur has to be handled and shipped out of the refinery. By the time all of this is done, the process to make LSD (the fossil fuel kind) is almost the same as the process to make premium gasoline. So LSD has a similar price at the pump as gasoline. I have been retired 15 years now, I don't know what the requirements for farm diesel is - is it still 500 ppm sulfur?