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Most fuel efficient RPM?



 
 
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  #1  
Old October 17th 07, 09:10 PM posted to rec.autos.driving
[email protected]
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Posts: 530
Default Most fuel efficient RPM?

What's a reasonable way to determine at what RPM your vehicle gets the
most mileage per gallon of gas? When driving a stick, I tend to drive
by feel. I had an old VW that was content cruising @ 1500rpm or so
all day (assuming no noteworthy hills) while my current pickup seems
to want to be above 2000. So I'm wondering, at what RPM would I get
the best mileage? It seems like mileage may improve if I shifted up a
gear on country roads to bring the RPM down to 1500 or so, but the
truck feels as if it's bogging. Also, peak HP is made @ 5000 RPM
(which feels like redline) & peak torque is made @ 3750 RPM, which may
be more telling.

It should be noted that a brisk highway run puts me about 3800 RPM,
and mileage really suffers compared to the same run @ 65mph.

Ads
  #3  
Old October 17th 07, 09:48 PM posted to rec.autos.driving
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Default Most fuel efficient RPM?

On Oct 17, 4:15 pm, (Timothy J. Lee) wrote:
> In article . com>,
>
> > wrote:
> >What's a reasonable way to determine at what RPM your vehicle gets the
> >most mileage per gallon of gas?

>
> If you have an OBD-II car, plug in an OBD-II scanner that can read out
> instantaneous fuel consumption and use it to determine what the fuel
> consumption is at various RPMs and speeds. However, you'll need a flat
> road with little traffic to conduct your experiment safely. Perhaps
> also a passenger reading the scanner and recording RPMs, speeds, and fuel
> consumption while the driver tries different RPMs and speeds.
>
> --
> ------------------------------------------------------------------------
> Timothy J. Lee
> Unsolicited bulk or commercial email is not welcome.
> No warranty of any kind is provided with this message.


Good call. It's a 98, so it should be compliant. Of course, I'd need
a scanner that will give me the instantaneous fuel consumption. That
may cost more than I could ever hope to save in fuel.

  #4  
Old October 18th 07, 01:32 AM posted to rec.autos.driving
gpsman
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Posts: 3,233
Default Most fuel efficient RPM?

On Oct 17, 4:48 pm, " > wrote:
> On Oct 17, 4:15 pm, (Timothy J. Lee) wrote:
>
>
>
> > In article . com>,

>
> > > wrote:
> > >What's a reasonable way to determine at what RPM your vehicle gets the
> > >most mileage per gallon of gas?

>
> > If you have an OBD-II car, plug in an OBD-II scanner that can read out
> > instantaneous fuel consumption and use it to determine what the fuel
> > consumption is at various RPMs and speeds.

>
> Good call. It's a 98, so it should be compliant. Of course, I'd need
> a scanner that will give me the instantaneous fuel consumption. That
> may cost more than I could ever hope to save in fuel.


Eh, maybe just take what you can from this guy's experience:
http://www.omninerd.com/articles/Imp...uel_Efficiency
-----

- gpsman

  #5  
Old October 18th 07, 03:26 AM posted to rec.autos.driving
DYM
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Posts: 164
Default Most fuel efficient RPM?

Scott in SoCal > wrote in
:

> " > said in rec.autos.driving:
>
>>On Oct 17, 4:15 pm, (Timothy J. Lee) wrote:
>>> In article . com>,
>>>
>>> > wrote:
>>> >What's a reasonable way to determine at what RPM your vehicle gets
>>> >the most mileage per gallon of gas?
>>>
>>> If you have an OBD-II car, plug in an OBD-II scanner that can read
>>> out instantaneous fuel consumption and use it to determine what the
>>> fuel consumption is at various RPMs and speeds. However, you'll
>>> need a flat road with little traffic to conduct your experiment
>>> safely. Perhaps also a passenger reading the scanner and recording
>>> RPMs, speeds, and fuel consumption while the driver tries different
>>> RPMs and speeds.

>>
>>Good call. It's a 98, so it should be compliant. Of course, I'd need
>>a scanner that will give me the instantaneous fuel consumption. That
>>may cost more than I could ever hope to save in fuel.

>
> A code scanner will always be useful, so you can't really look at it
> like that.


Just for laughs, about how much is a code scanner?

Doug
  #6  
Old October 18th 07, 10:07 PM posted to rec.autos.driving
AJ[_7_]
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Posts: 1
Default Most fuel efficient RPM?


wrote:
> What's a reasonable way to determine at what RPM your vehicle gets the
> most mileage per gallon of gas? When driving a stick, I tend to drive
> by feel. I had an old VW that was content cruising @ 1500rpm or so
> all day (assuming no noteworthy hills) while my current pickup seems
> to want to be above 2000. So I'm wondering, at what RPM would I get
> the best mileage? It seems like mileage may improve if I shifted up a
> gear on country roads to bring the RPM down to 1500 or so, but the
> truck feels as if it's bogging. Also, peak HP is made @ 5000 RPM
> (which feels like redline) & peak torque is made @ 3750 RPM, which may
> be more telling.
>
> It should be noted that a brisk highway run puts me about 3800 RPM,
> and mileage really suffers compared to the same run @ 65mph.


You should determine your brake-specific-fuel-consumption at various
RPMs. Quite simply it's fuel consumption/power.

Many (most?) cars are optimized for about 55mph since that's the speed
they do highway fuel economy at.

Keep in mind a full load of groceries or old crap in the trunk will
also affect your mileage, as will tire pressure and fuel octane. It
must be noted however, that if your car isn't designed to benefit from
high octane you're just ****ing money away.

  #7  
Old October 18th 07, 10:17 PM posted to rec.autos.driving
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Posts: 530
Default Most fuel efficient RPM?

On Oct 17, 8:32 pm, gpsman > wrote:
> On Oct 17, 4:48 pm, " > wrote:
>
>
>
>
>
> > On Oct 17, 4:15 pm, (Timothy J. Lee) wrote:

>
> > > In article . com>,

>
> > > > wrote:
> > > >What's a reasonable way to determine at what RPM your vehicle gets the
> > > >most mileage per gallon of gas?

>
> > > If you have an OBD-II car, plug in an OBD-II scanner that can read out
> > > instantaneous fuel consumption and use it to determine what the fuel
> > > consumption is at various RPMs and speeds.

>
> > Good call. It's a 98, so it should be compliant. Of course, I'd need
> > a scanner that will give me the instantaneous fuel consumption. That
> > may cost more than I could ever hope to save in fuel.

>
> Eh, maybe just take what you can from this guy's experience:http://www.omninerd.com/articles/Imp...s_Affecting_Fu...
> -----
>
> - gpsman- Hide quoted text -
>
> - Show quoted text -


That was a fairly interesting read, thanks.

  #8  
Old October 18th 07, 10:18 PM posted to rec.autos.driving
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Posts: 530
Default Most fuel efficient RPM?

On Oct 17, 9:46 pm, Scott in SoCal > wrote:
> " > said in rec.autos.driving:
>
>
>
>
>
> >On Oct 17, 4:15 pm, (Timothy J. Lee) wrote:
> >> In article . com>,

>
> >> > wrote:
> >> >What's a reasonable way to determine at what RPM your vehicle gets the
> >> >most mileage per gallon of gas?

>
> >> If you have an OBD-II car, plug in an OBD-II scanner that can read out
> >> instantaneous fuel consumption and use it to determine what the fuel
> >> consumption is at various RPMs and speeds. However, you'll need a flat
> >> road with little traffic to conduct your experiment safely. Perhaps
> >> also a passenger reading the scanner and recording RPMs, speeds, and fuel
> >> consumption while the driver tries different RPMs and speeds.

>
> >Good call. It's a 98, so it should be compliant. Of course, I'd need
> >a scanner that will give me the instantaneous fuel consumption. That
> >may cost more than I could ever hope to save in fuel.

>
> A code scanner will always be useful, so you can't really look at it
> like that.
> --
> MFFYCam Videos Galohttp://www.geocities.com/mffycam/htt...ills.blip.tv/- Hide quoted text -
>
> - Show quoted text -


Maybe, but it looks like I'd be a few hundred into it to get one that
will give me fuel consumption and such. So far, every time I've
needed a code scanner, I've got to Advanced Auto Parts and borrowed
theirs for free. So basically I'd be spending hundreds for this
experiment, and the convience of having my own scanner instead of
driving up the street to Advanced. It's a tough sell.

  #9  
Old October 23rd 07, 11:31 PM posted to rec.autos.driving
bugalugs
external usenet poster
 
Posts: 51
Default Most fuel efficient RPM?

wrote:
> On Oct 17, 9:46 pm, Scott in SoCal > wrote:
>> " > said in rec.autos.driving:
>>
>>
>>
>>
>>
>>> On Oct 17, 4:15 pm, (Timothy J. Lee) wrote:
>>>> In article . com>,
>>>> > wrote:
>>>>> What's a reasonable way to determine at what RPM your vehicle gets the
>>>>> most mileage per gallon of gas?
>>>> If you have an OBD-II car, plug in an OBD-II scanner that can read out
>>>> instantaneous fuel consumption and use it to determine what the fuel
>>>> consumption is at various RPMs and speeds. However, you'll need a flat
>>>> road with little traffic to conduct your experiment safely. Perhaps
>>>> also a passenger reading the scanner and recording RPMs, speeds, and fuel
>>>> consumption while the driver tries different RPMs and speeds.
>>> Good call. It's a 98, so it should be compliant. Of course, I'd need
>>> a scanner that will give me the instantaneous fuel consumption. That
>>> may cost more than I could ever hope to save in fuel.

>> A code scanner will always be useful, so you can't really look at it
>> like that.
>> --
>> MFFYCam Videos Galo
http://www.geocities.com/mffycam/htt...ills.blip.tv/- Hide quoted text -
>>
>> - Show quoted text -

>
> Maybe, but it looks like I'd be a few hundred into it to get one that
> will give me fuel consumption and such. So far, every time I've
> needed a code scanner, I've got to Advanced Auto Parts and borrowed
> theirs for free. So basically I'd be spending hundreds for this
> experiment, and the convience of having my own scanner instead of
> driving up the street to Advanced. It's a tough sell.
>

Why not do it the quick and dirty way and look at the torque and
horsepower curves for your vehicle. Where the two cross should be pretty
close.

Wont be a best fit for some vehicles but should do most
  #10  
Old October 24th 07, 11:27 PM posted to rec.autos.driving
Bernard Farquart
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Posts: 8
Default Most fuel efficient RPM?


"Scott in SoCal" > wrote in message
news
> DYM > said in rec.autos.driving:
>
>>Just for laughs, about how much is a code scanner?

>
> http://www.autotap.com/product_family.asp?FamilyId=260
> --


Or, if you have one of the larger auto parts chains in
your area, you can leave a deposit (usually 200 bucks)
and rent one. I know that Checker-Schucks-Kragen-Murray's
stores will, I believe Autozones do, too.

Bernard


 




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