Join Date: Nov 2014
Location: Burlington, Ontario, Canada
Correct me if Iím wrong, but ĎTop Tierí is a privately administered program for fuel standards, where suppliers must go through very expensive testing and also pay licensing fees to be able to label their products ĎTop Tierí.
My understanding is than many companies choose not to pay-up to enroll in this program, even though their fuels might meet the Top Tier quality standards (similar situation as JASO standards/testing for oils).
In any case, I donít know about the US, but all gas here in Canada must contain a certain level of detergent and additives to help prevent buildup, possibly putting it close to Top Tier standards.
To be honest, Iíd be more concerned about ethanol content... that shit can be quite corrosive.