Toyota: Fuel mileage 91 octane vs. 87

It's difficult to access economy when the driver knows 91 octane
or 87 octane is in the tank.

"Tegger®" <invalid> wrote in message
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At 
is 

mark_digital© wrote: 

Why? Going in, TeGGer did not have an MPG expectation one way or the
other.
--

~~Philip

"Never let school interfere
with your education - Mark Twain"

Tegger® wrote: 

Same thing occurs with the '03 Corolla and the ol Prizm. Lower
mileage using Premium grades, more so in city driving. Both cars
have 87 octane recommendation. While the Prizm had no knock sensor,
the Corolla does. An interesting side note is both of my Honda
motorcycles exhibit a similar drop using Premium. All four vehicles
are four valve head designs.
--

~~Philip

"Never let school interfere
with your education - Mark Twain"

I think that if you use the "recommended" fuel for your vehicle as stated by
the manufacture, you would get the optimal fuel economy. Running premium on
engines designed to run on the recommended fuel of regular unleaded, will
only cost you more $$ but may or may not offer you additional benefits.

Has anyone ran any tests on the 1MZ-FE V6 Camry engines using regular vs.
premium grade fuel? In my observations, I noticed a slightly better fuel
avg. using premium as well as smoother, quicker acceleration. Of course
YMMV.


"Philip®" <net> wrote in message
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"Car Guy" <com> painstakingly pecked in
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I wonder if using higher octane fuel in a high-mileage engine--or one used
regularly at high engine speeds--would help prevent detonation?

--
TeGGeR®

"Tegger®" <invalid> wrote in message
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Does running regularly at high engine speeds increase the problem of
detonation?
Paul

On Tue, 9 Sep 2003 12:20:00 -0400, "Car Guy" <com>
wrote:
 

I tried the higher octane fuel in two Cavalier's I owned in the mid
and late 80's. Both lost gas milage and seemed to have a little less
power.

Once I bought the new '94 and '03 Corolla's I stuck with the
recommended 87 octane. Both cars have always gave me 35 to 40 mpg.
I figure the engineering is good enough for the 87 I will stick with
it.
I still use Chevron with the Techron additive as my favorite . Texaco
is my other favorite usually when traveling. The new Shell is also a
clean burn gasoline. I use it if the price if right.

I have heard of some Ford engines that get better performance and gas
milage from using high octane fuel.
Corollafan

"Car Guy" <com> wrote in message
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1999 Camry LE V6 (1MZ-FE) here:
87 octane yielded 26-28 MPG on a mixed commute of 14 miles, warm climate,
400' elevation, no hills (50% highway, 30% 45mph-ish, 20% <45mph). Tires at
44PSI hot.
Driving with an egg under the throttle.
93 octane yielded approximately 1MPG improvement in the same driving
circumstances (to the best of my ability)
I am currently using 89 (mid grade) on the last 6 tanks and still appear to
be at 27-29MPG (with a best of 31MPG and a worst of 25MPG)