Well---on the diesel/gas===there are only so many gallons of stuff that can be made for so many gallons of stuff

And Diesel is very seasonal commodity--example---springtime--farmers fill there tanks and get into fields--contractors fill there tanks and all equipment and go to work--fall/winter-home heating oil ( of course for heating, we also use coal, natural gas, propane,butane so demand is not as concentrated as diesel demand)