http://www.toptiergas.com/
Quote:
Why TOP TIER
The intention of the TOP TIER Detergent Gasoline standards is to create a winning situation for gasoline retailers, auto manufacturers and drivers. Currently, many gasoline retailers provide fuels with lower-quality additive packages that can build up deposits on fuel injectors and on intake valves. Others can build up deposits in combustion chambers and may lead to intake valve sticking. These lower levels of additives can have negative impacts on engine performance and vehicle responsiveness.
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Good read.
I am in Canada, so it is Petro Can first (because of 94), then Shell, with Ethanol free 91.
