More on Top Tier gasoline

Usually I get 24 miles to the gallon for stop-and-go city
driving with the '06 Camry LE, but this last tankful I got
28 city.  I really babied the accelerator pedal this time
and, of course, have plenty of air in the tires.  I had
Shell V-Power premium in the tank this time (for its
exceptional detergent levels), but usually I just put in
a regular grade.

I had Hy-Vee Grocery Store premium in there two tankfuls
back, and thought the car was idling kinda rough sometimes
while stopped, so I thought some Shell V-Power was in
order to help clean out any minute amounts of potential
gunk I might have gotten from the Hy-Vee gas.

When I asked him, the Hy-Vee manager said his gas met
the Top Tier standard, but Hy-Vee is not on the list
of Top Tier stations at toptiergas.com, so I doubt
Hy-Vee is Top Tier.

On Hy-Vee, the car once idled at only 600 rpm; I've never
seen it idle so low.  Usually 650 to 700 is the lowest it'll
idle at.  It could have been a coincidence that the one 600
idle happened under Hy-Vee.

Quoting the Break Time page at the MFA Oil web site:

"TOP TIER Gasoline is a new class of gasoline with enhanced
detergency.  It meets new, voluntary deposit control standards
developed by four automotive companies - BMW, General Motors,
Honda and Toyota - that exceed the detergent requirements
imposed by the EPA.

"TOP TIER Gasoline keeps engine parts cleaner by reducing
fuel-related deposits, resulting in better performance.
A lower level of detergent may cause a buildup of deposits on
critical engine parts.  These deposits can cause stalling,
rough idling, lowered acceleration and other unnecessary
problems in your vehicle--and your life.

"TOP TIER Gasoline:

* Improves fuel efficiency
* Prevents driving upsets (rough idle, hesitation, stalling
  and surge)
* Improves acceleration
* Provides more power
* Reduces emissions
* Cleans dirty engines and keeps new engines clean

MFA Oil Company is proud to join industry leaders by requiring
TOP TIER Gasoline with higher levels of detergent in all grades
and every gallon of gasoline at Break Time Convenience Stores.

Link: http://www.mfaoil.com/index.cfm?show=10&mid=14&pid=4