In response to the ;rst question regarding detergency,
AAA conducted a blind study comparing three Top Tier
fuels with three non-Top Tier fuels. All six fuels were
run in the ASTM D6201 engine test for 100 hours. The
results indicated that the Top Tier fuels produced 19 times
fewer deposits than the non-Top Tier fuels (see Figure
3). (The report, “AAA Fuel Quality Research: Proprietary
research into the effectiveness of fuel additive packages in
commercially-available gasoline,” is available at https://bit.
AAA addressed the second question regarding premium
fuel as a special treat for customers’ vehicles in a separate
In that study, the higher octane premium fuel showed
no improved cleaning bene;t or performance bene;t
unless the engine was designed for higher octane fuel. The
study concluded that vehicle owners should:
1. Follow vehicle owners manuals for octane
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Photos of an intake valve taken before and after AAA’s 100-hour engine test
comparing three Top Tier fuels with three non-Top Tier fuels summarize the
AAA blind study: Top Tier fuels produced 19 times fewer deposits than the
non-Top Tier fuels.