switching from premium to regular in 2006 GS300 V6

Toyota/Lexus optimise their engines for the region it is sold in, and a
specific rating
On this side of the pond LPG is sold and cars not origonally sold to use it
can be adapted. We are told there is no detrimental effect.
However when I spoke to Toyota HO Tech I was advised that their tests had
shown it caused damage to the engine.
Not what you asked but you may be interested.

"kitzler" <njanus.DeleteThis@optonline.net> wrote in message
news:1169047720.286957.193490@m58g2000cwm.googlegroups.com...
> Not that an extra couple of bucks per tankful will break me, but I just
> read an article by M. Niedermayer in "Truth about cars" stating among
> other things, that using regular gas instead of premium in a high
> compression (11 to 1) engine would not affect performance or mileage by
> more than a percent or two. He went on about not changing your oil,
> but perhaps only once a year, as today's oils and today's engine are
> tuned to avoid sludge formation and crankcase contamination, but that
> is another story. I just would like to send out a feeler to see if any
> of you folks have had good or bad experiences with using regular versus
> premium gas in your Lexus'... I just hate enriching gas purveyors
> unnecessarily.......
>
 >> Stay informed about: switching from premium to regular in 2006 GS300 V6 

On 17 Jan 2007 07:28:40 -0800, "kitzler" <njanus DeleteThis @optonline.net> wrote:

> Not that an extra couple of bucks per tankful will break me, but I just
> read an article by M. Niedermayer in "Truth about cars" stating among
> other things, that using regular gas instead of premium in a high
> compression (11 to 1) engine would not affect performance or mileage by
> more than a percent or two. He went on about not changing your oil,
> but perhaps only once a year, as today's oils and today's engine are
> tuned to avoid sludge formation and crankcase contamination, but that
> is another story. I just would like to send out a feeler to see if any
> of you folks have had good or bad experiences with using regular versus
> premium gas in your Lexus'... I just hate enriching gas purveyors
> unnecessarily.......

My experience with my 2006 GS300 is that going from 87 to 89 octane
increases mileage a bit more than the cost differential, and going up to 91
or 93 increases mileage further, but not necessarily by as much as the cost
rises. It is much easier to measure this for highway driving than chugging
around in the city, as mileage in the city is much more traffic dependent.

I observed the same behavior with a 1997 Toyota Avalon, and a 1998 Audit
A6Quattro. For all of these cars, 89-91 octane was the "sweet spot" in
terms of cost per mile.
-Jay-
 >> Stay informed about: switching from premium to regular in 2006 GS300 V6 

I was using 87 octane in my 2000 ES300 and the car ran fine. I tried
premium, and the car's gas mileage went up, more than compensating for the
increased price. Your mileage may vary:)

"kitzler" <njanus DeleteThis @optonline.net> wrote in message
news:1169047720.286957.193490@m58g2000cwm.googlegroups.com...
> Not that an extra couple of bucks per tankful will break me, but I just
> read an article by M. Niedermayer in "Truth about cars" stating among
> other things, that using regular gas instead of premium in a high
> compression (11 to 1) engine would not affect performance or mileage by
> more than a percent or two. He went on about not changing your oil,
> but perhaps only once a year, as today's oils and today's engine are
> tuned to avoid sludge formation and crankcase contamination, but that
> is another story. I just would like to send out a feeler to see if any
> of you folks have had good or bad experiences with using regular versus
> premium gas in your Lexus'... I just hate enriching gas purveyors
> unnecessarily.......
>
 >> Stay informed about: switching from premium to regular in 2006 GS300 V6 

Jay Somerset wrote:

> My experience with my 2006 GS300 is that going from 87 to 89 octane
> increases mileage a bit more than the cost differential, and going up to 91
> or 93 increases mileage further, but not necessarily by as much as the cost
> rises. It is much easier to measure this for highway driving than chugging
> around in the city, as mileage in the city is much more traffic dependent.
>
> I observed the same behavior with a 1997 Toyota Avalon, and a 1998 Audit
> A6Quattro. For all of these cars, 89-91 octane was the "sweet spot" in
> terms of cost per mile.
> -Jay-

Thanks Jay, most of my travel is at relatively high speed, 50-70, and I
shall use your observations... it actually makes sense, by increasing
the octane you allow the engine timing to be advanced and doing so
increases power without damaging the engine valves.. I also worry about
Toyota's fling of using i, meaning they use fuzzy logic to do certain
things, in the case of the engine it is ECT-i which stands for
electronic controlled Timing with intelligence.. so monkeying around
with this logic may prove to be dangerous.. by the way, I disabled the
intelligence vector in my automatic transmission by switching to
driving in the S-mode, where Lexus allows the driver to limit the speed
range (downshift only sad to say) of the transmission, that way I avoid
having excessive engine braking when I take my foot off the gas......
 >> Stay informed about: switching from premium to regular in 2006 GS300 V6 

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 >> Stay informed about: switching from premium to regular in 2006 GS300 V6