fuel refineries meet the MINIMUM standards. Have you ever burned gasoline on a petree(sp?) dish? It leaves carbon residue. Do you have black smudges on your exahust within a few days of a wash? It's because the fuel isn't burning completely.
Additives are used to alter viscosity, flash point, cetane/octane, evaporation, stability, corrosion, etc. Look up the World Wide Fuel Charter and then tell us that additives are bad.
Every engine manufacturer has signed it in agreement that there is large room for improvements in fuels.