I've read several articles that claim that this polyisobutylene, added in minute quantities to gasoline, increases fuel economy around 20%. I did a search yesterday and found out that some 2 stroke oils have this compound. Particularly the synthetic "smokeless" variety. I'm not familiar with the different brands of 2-stroke oil out there except the Amsoil and TORCO (which aren't available at Autozone). Would anyone know which brands are available over the counter with PIB? Also, has anyone found PIB to work as claimed? Thanks in advance.