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Posted by NeoPhyte_Rep on August 26, 2006, 10:24 am
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mrv@kluge.net wrote:
> NeoPhyte_Rep wrote:
>
>> Please expand the acronym ISC.
>
> good question. For some reason, I had ISC stuck in my head.
> Basically, I meant that the ECU does store information about your
> driving and external parameters and adjusts accordingly.
>
>> Are you saying the Prius' ECU uses more than atmospheric conditions,
>> accelerator pedal position, and the state of charge of the traction
>> battery to determine how to control the engine? Do you have a Toyota
>> document that explains this?
>
> Hm, buried in ome of these technical threads is the answer...
> http://autos.groups.yahoo.com/group/Prius_Technical_Stuff/message/17408
> http://autos.groups.yahoo.com/group/Prius_Technical_Stuff/message/17164
> http://autos.groups.yahoo.com/group/Prius_Technical_Stuff/message/17454
> but unfortunately, I'm having trouble searching back in my archives far
> enough for when the ECU upgrade was released, or when the Classics had
> the battery resealing done (where many more people
> noticed/complained)...
>
>> This is not in regards to any governmental fuel rating. This is in
>
> Just a reminder about the governmental ratings - they don't take into
> account heater or AC use, which both will lower fuel efficiency.
>
>> relation to my personal recorded tank fillings and computer readouts. I
>> record both and both are down about 5 mpg. I consider that
>> statistically significant.
>
> other thoughts:
> 1. It's summer in the northern hemisphere, and winter in the southern
> hemisphere. Temperatures are more extreme than a few months ago, which
> means that the gasoline engine will be running more to provide for the
> added climate control for these extremes.
> 2. did any change in fuel occur since your upgrade? summer/winter
> blend? addition of ethanol?
> 3. did you have anything else done at the same time as the upgrade?
> dealers are notorius for using the wrong grade of oil, oil overfill,
> and not setting tire pressures correctly.
> 4. have you checked your parking/emergency brake? sometimes they do
> get a little sticky.
> 5. have you hit a pothole or curb, that may have knocked your alignment
> out?
>
1. As I said I first suspected more use of the air conditioning, but
that is back to normal and the mileage isn't.
2. I don't remember if the service occurred at the same time as the
seasonal mixture change, but that would affect more than my Prius, which
is why I came here for the experience of others.
3. I think I'm going to research these possibilities deeper. I haven't
been in the habit of checking the dealer's employee's work, but maybe I
should be more careful.
4. I'll dig into this one, too.
5. No potholes of significance. Lot's of small bumps since there's a
growing lack of road maintenance to save budget.
Thanks for your suggestions.
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