In the carb. tuning section,there is a reference to the types of petrol available,eg.super unleaded etc.just for information,I have many times unloaded road tankers of distillate(all compartments full),these tankers are also used to transport fuel to retail outlets,carrying petrol and derv,loading up at a local refinery.I asked the drivers ,are the compartments flushed after delivery at my workplace,before being filled for use to the retail outlets,as it is impossible to pump out the distillate from them,you can guess the answer!So for example,Shell Pura with some derv or kero or distillate is a factor to consider when jetting your motor