FUel varies quite wildly due to the quantity and quality of additives, can't really comment on diesel as I don't like it. But What upthalbion1970 says is similar to my race experience.
Going back ten years or so lots of people were having reliability issues with old race engines, all down to...
All fuels are the same ( for us commoners) and come from only a handful of refineries. The difference is the additives, which accounts for some of the cost. I recently designed an injector stream cabinet . . . .when the tankers fill up they get BP/Shell/Stressco etc options, press the button and...