Further perusing the QT site, they claim detergency has been cut in other brands. Never heard that one before:
http://www.quiktrip.com/gasoline/toptier.asp
FWIW I generally prefer QT, Phillips/Conoco or Shell to non-name brand, Mobil or BP since QT controls the St. Louis market and everyone follows them almost to the penny. On the other hand I kind of resent a company that uses bright c-stores, cheap soda and lots of cops hanging around to build a semi-monopoly.
Top Tier Gasoline - Quality Gasoline Additives
QuikTrip Guaranteed Gasoline with IQ has been approved by a group of automobile manufacturers as a Top Tier Gasoline. This group is composed of BMW, General Motors, Honda, and Toyota automakers who are concerned about the low levels of detergent additives in gasoline. These companies have created a new voluntary deposit control standard for gasoline that exceed those of EPA's deposit control rule. Their purpose is to define a new class of commercial gasoline with enhanced detergency called Top Tier Detergent Gasoline.
Over the past several years, the minimum level of detergent additive required by the EPA has declined by an estimated 50%. As a result, the ability of vehicles to maintain stringent Tier 2 emission standards have been hampered, leading to engine deposits which can have a big impact on in-use emissions and customer satisfaction.
QuikTrip Guaranteed Gasoline with the IQ additive is one of the first to be recognized as meeting the Top Tier standards. QuikTrip has maintained a high additive level for several years, so meeting the Top Tier requirements was easily attained. All grades of QuikTrip Guaranteed Gasoline meet the Top Tier requirements.
For more information concerning quality Top Tier Detergent Gasoline, go to
www.toptiergas.com.