2006 Vue gas mileage

On 7 Aug 2006 12:31:16 -0700, "tut0101" > wrote:

>And as to fuel type, this engine is set up for 87 octane fuel, so if
>you want the best performance/efficiency, that's what you should stick
>with. Higher octane fuel is less flammable, so unless your car is
>designed to operate at higher compression, using 89 octane fuel will
>result in poorer fuel economy as less of the fuel is actually being
>burnt by the engine.


This is a BIG bunch of BS. I do not know how started this poorer
economy and unburnt fuel thing. Pure garbage! That engine is
"designed" to TOLERATE 87 octane, not do it best on it. (this is the
ONLY reason that there is a knock sensor and 87 octane was designed
for 8 to 1 CR and they use spark timing trickery that reduces power
and efficency to allow engine to "run" om 87) Every time the ECM
retards spark from low octane fuel it hurts MPG silently. If 87 is the
best as you claim then why does Detriot always run EPA MPG tests using
93 octane huh??? Keep beleiving the myth if you want because it is
costing you money and power not me.
-----------------
TheSnoMan.com

On 7 Aug 2006 17:01:15 -0700, "tut0101" > wrote:

>87 Octane is certainly not 'the best' gasoline possible. It is however
>the gasoline which the computer in the VUE is calibrated to run with,
>therefore, it is the best gasoline to run in the stock VUE. Higher
>octane gasoline is designed to burn at the higher temperatures that
>higher compression engines run at. The EPA tests are run with higher
>octane because they are not run with the stock computer calibration.

You are thinking here but wrong logic. Again the ONLY reason ther is a
not sesor is becuase of people that will burn the cheapest gas they
can find. It is calibrated to tolerate it only and nothing more (the
knock sensor is the biggest part of this "calibration") In order to
rextract maximum power and efficency in a engine you want peak
pressure to be achevied not latter than 5 or 10 degrees after top dead
center to get maximum capture of energy from expanding gasses. You
engines timing (before knock sensor input) is calibrated to very
timing relative to load and RPM to obtain this peak pressure at this
point. What happens is the knock sensor enters the picture and retards
spark so that not only is the peak pressure point delay but it is also
a lower peak pressure so less power is extracted from mixture and less
MPG results (this is why some cars can get really nasty MPG and be
sluggish in hot weather in city traffic with A/C on) Engine are more
prone to power loss from this at lower RPMs because at higher RPM's
the mixture is expanding so quickly that detination is somewhat easier
to control (by high I am talking above say 3500 to 4000 RPM). I
actually studies IC engine design and theory in college many years ago
while persuing a engineering degree and the basic priciple of
operation of a IC engine has not changed. If they would scarp 87
octane fleet wide, gas consumption would likely drop 3 to 5% on a
national level and if they would scrape it and build engine with 11 to
1 CR and higher MPG would improve further and the difference or edge
of a diesel engine would decrease in a lot of applications but it the
peoples love or addiction for 87 that puts a damper on this.
-----------------
TheSnoMan.com

SnoMan wrote:
> On 7 Aug 2006 17:01:15 -0700, "tut0101" > wrote:
>
> >87 Octane is certainly not 'the best' gasoline possible. It is however
> >the gasoline which the computer in the VUE is calibrated to run with,
> >therefore, it is the best gasoline to run in the stock VUE. Higher
> >octane gasoline is designed to burn at the higher temperatures that
> >higher compression engines run at. The EPA tests are run with higher
> >octane because they are not run with the stock computer calibration.
>
> You are thinking here but wrong logic. Again the ONLY reason ther is a
> not sesor is becuase of people that will burn the cheapest gas they
> can find. It is calibrated to tolerate it only and nothing more (the
> knock sensor is the biggest part of this "calibration") In order to
> rextract maximum power and efficency in a engine you want peak
> pressure to be achevied not latter than 5 or 10 degrees after top dead
> center to get maximum capture of energy from expanding gasses. You
> engines timing (before knock sensor input) is calibrated to very
> timing relative to load and RPM to obtain this peak pressure at this
> point. What happens is the knock sensor enters the picture and retards
> spark so that not only is the peak pressure point delay but it is also
> a lower peak pressure so less power is extracted from mixture and less
> MPG results (this is why some cars can get really nasty MPG and be
> sluggish in hot weather in city traffic with A/C on) Engine are more
> prone to power loss from this at lower RPMs because at higher RPM's
> the mixture is expanding so quickly that detination is somewhat easier
> to control (by high I am talking above say 3500 to 4000 RPM). I
> actually studies IC engine design and theory in college many years ago
> while persuing a engineering degree and the basic priciple of
> operation of a IC engine has not changed. If they would scarp 87
> octane fleet wide, gas consumption would likely drop 3 to 5% on a
> national level and if they would scrape it and build engine with 11 to
> 1 CR and higher MPG would improve further and the difference or edge
> of a diesel engine would decrease in a lot of applications but it the
> peoples love or addiction for 87 that puts a damper on this.
> -----------------
> TheSnoMan.com


Unscientific study:
I just spoke to a number (read: 5-6) people who work at GM and/or
American Axle, and they all said that the vehicles are designed to
perform on 87 octane and there is no reason to pay more. It's hearsay,
I know. Don't shoot the messenger. I have no personal knowledge of
what I speak LOL.

Now, unless there is an OEM/Petroleum industry conspiracy....
SC

On 11 Aug 2006 11:53:38 -0700, "Sir Creep" >
wrote:

>Unscientific study:
>I just spoke to a number (read: 5-6) people who work at GM and/or
>American Axle, and they all said that the vehicles are designed to
>perform on 87 octane and there is no reason to pay more. It's hearsay,
>I know. Don't shoot the messenger. I have no personal knowledge of
>what I speak LOL.


It is your nickle but the science behind it does not lie and I would
not value a opinion for a axle company on thremodynamic engine design
and efficecy. BTW, do you honestly think that someone at GM is going
to tell you that you need better octane for there cars??? Of course
not because if they did it could potnetailly hurt sales because Ford
and Dodge would then say that they do not need the more expensive gas
to run best (they do need it too though) It is all part of a big
fabrication. Use 87 if it makes you happy but it is costing you money,
performance and MPG, especailly in hot weather. Like I siad my
daughter 97 SC2 is a slug on 87 in hot weather with A/C and runs
really well with higher octane fuel. THe abily to burn 87 is a selling
feature but abilty does not mean it is the best fuel for it.
-----------------
TheSnoMan.com

Is the vehicle in question capable of automatically advancing or
alternatively, retarding, the engine timing? If not, then there is no
advantage to higher octane. If it can, then the premium fuel may give
better performance.

Bob

"SnoMan" > wrote in message
...
> On 11 Aug 2006 11:53:38 -0700, "Sir Creep" >
> wrote:
>
>>Unscientific study:
>>I just spoke to a number (read: 5-6) people who work at GM and/or
>>American Axle, and they all said that the vehicles are designed to
>>perform on 87 octane and there is no reason to pay more. It's hearsay,
>>I know. Don't shoot the messenger. I have no personal knowledge of
>>what I speak LOL.
>
>
> It is your nickle but the science behind it does not lie and I would
> not value a opinion for a axle company on thremodynamic engine design
> and efficecy. BTW, do you honestly think that someone at GM is going
> to tell you that you need better octane for there cars??? Of course
> not because if they did it could potnetailly hurt sales because Ford
> and Dodge would then say that they do not need the more expensive gas
> to run best (they do need it too though) It is all part of a big
> fabrication. Use 87 if it makes you happy but it is costing you money,
> performance and MPG, especailly in hot weather. Like I siad my
> daughter 97 SC2 is a slug on 87 in hot weather with A/C and runs
> really well with higher octane fuel. THe abily to burn 87 is a selling
> feature but abilty does not mean it is the best fuel for it.
> -----------------
> TheSnoMan.com
>