I found this AAA study on Top Tier fuels:
https://www.sinclairoil.com/sites/de...rt-FINAL-1.pdf
Key Findings from the Abstract re-listed here:
Key Findings:
1. The test engine operated on a TOP TIER gasoline averaged 19 times fewer intake valve
deposits than when it was operated on non- TOP TIER gasoline.
2. Based upon secondary research findings, long-term use of a gasoline without an enhanced
additive package can lead to reductions in fuel economy of 2-4%, drivability issues, and
increased emissions.
3. In most cases, carbon deposits can be reduced or removed from critical engine components
by switching to a gasoline that meets TOP TIER standards.
4. Approximately six in ten drivers (63%) believe there is a difference in the quality of gasoline
sold by retailers, yet only (12%) of drivers purchase gasoline based upon its detergent
additive package. The primary motivation for choosing a particular gas station is location /
convenience (75%), followed closely by the price of the fuel (73%).
5. Most TOP TIER gasolines do not cost significantly more than non-TOP TIER gasoline. The
average price difference between the TOP TIER and non-TOP TIER brands surveyed was
three cents per gallon over a 12-month period.
So I'm not the only one interested in the cleaning properties of gasoline fuels. :P
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