Transportation fuels, specifically diesel fuel, play a vital role in the expanding global economy. Governments and social agencies are tightening fuel specifications and the demands from consumers for higher fuel economy and better engine performance are unrelenting. Engine manufacturers are constantly improving engine designs, particularly fuel injectors, and requiring better fuel quality. The demands on fuel get worse when the rulemaking entities cannot agree on reasonable specifications and require inadequate or inappropriate tests. The only help the fuel is getting is from the additive supplier.