One big difference is taxes! Also additives and where I live 10% ethanol is required at the pump. Off road usages are less complicated and pay better, all things considered. That is not to say there won't be a time when we see gas pump sales.
In the interests of profit....Gasoline at the pump does have many additives to increase octane and make it cheaper to produce. The naptha/gasoline coming out of the JBII processor is Pure Gasoline.....like from the old days I imagine........z