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 what is the best rpm to get the best mileage on 1.5 diesel?

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Krsna
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PostSubject: what is the best rpm to get the best mileage on 1.5 diesel?   Wed Nov 14, 2012 3:02 pm

can anyone tell me the ideal rpm in any gear to get the best fuel efficiency..
krsna
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vsuprak
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PostSubject: Re: what is the best rpm to get the best mileage on 1.5 diesel?   Thu Nov 15, 2012 12:46 pm

Hi Krsna,

Welcome to the forum.

I have a diesel. And from my usage for 5 years, I find that the ideal cruising RPM is to be around 2000rpm in 5th gear.

Ideally this is what you can get a good economy with (speed at which to change gear)
1st Gear 15-20kmph (max) Only for moving from standstill.
2nd Gear 25kmph
3rd Gear 35kmph
4th Gear 45-50kmph
5th Gear - do not exceed 80-85 kmph

Try around and see to achieve your ideal points. It will also vary depending on load and slopes of the road.

Surya


Last edited by vsuprak on Sun Nov 18, 2012 5:10 pm; edited 1 time in total (Reason for editing : Edited typo of 200rpm --> 2000rpm)
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Krsna
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PostSubject: Re: what is the best rpm to get the best mileage on 1.5 diesel?   Thu Nov 15, 2012 3:08 pm

Thank you very much Surya... I have been driving exactly as mentioned by you.
I get about 14-15Km/lt. in city with A/C and about 23-24km/lt. on highways with A/C.
Is this the best possible mileage one can get from a 1.5 diesel?
Regards,
Krsna
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Deccansand
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PostSubject: Re: what is the best rpm to get the best mileage on 1.5 diesel?   Thu Nov 15, 2012 4:02 pm

I get around 17/18 KMPL in city with AC. I generally dont exceed 2500 RPM. Due to traffic in city i stick to 3rd gear and move to 4th only when roads are clear & i am exceeding 2500 RPM. This way i avoid changing gears frequently between 3/4 and save my knees Smile.

Surprisingly during my last long drive to Goa ( about 1800kms) i got an average of 18/19 maybe i was speeding more Question
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PostSubject: Re: what is the best rpm to get the best mileage on 1.5 diesel?   Sun Nov 18, 2012 5:13 pm

Krsna,

Which city do you live in?
In my surveys for my company (Toyota), I found that customers in cities like Mumbai were getting extremely less mileage compared together cities. This was mainly due to the traffic conditions. For instance, if the mileage of a particular car in a city was 12kmpl, in Mumbai it turned out to be 6-7kmpl!!
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PostSubject: Re: what is the best rpm to get the best mileage on 1.5 diesel?   Sun Nov 18, 2012 9:38 pm

hi surya, i live in chennai... the mileage figures i had mentioned are calculated from full tank to full tank..
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PostSubject: Re: what is the best rpm to get the best mileage on 1.5 diesel?   Mon Nov 19, 2012 12:10 pm

I am a little puzzled because you mention that on highways you get close to 23kmpl which actually is a good mileage and a sign of things being OK.
But in the city it is as low as 14!!

I may sound weird, but I'll ask you 2 things.

1. Are you habituated to clutch driving? (keeping the foot on clutch pedal and pressing it partly even when not changing gears?)
2. Is possible, try to speak to any friends or other logan owners at your servcie center who use the same route as you do.
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PostSubject: Re: what is the best rpm to get the best mileage on 1.5 diesel?   Mon Nov 19, 2012 1:16 pm

Hi surya,

Just got back from a long tour of 980 km in 2 days,sat - sunday.

Dombivli- Pune-Jejuri- Solapur- Tulajapur-Solapur- Pune- Dombivli.

I had very less time 2 days for so much long distance, hence i just drive fast didn't looked for milage on 4 lane & 6 lanes...

I was keeping vehicle above 120 KMPH on 4 lane & 6 lanes...

Also on last monday changed to Ceat Milaze tyres for front, got a good performance really. ggod handling,less noise etc.....

I got avg of 20 kmpl i guess, as 1 bar is still showing on the display.after full tank before leaving.

I noticed one thing when we left with 5 people & lots of luggage. the car was feeling very heavy to drive, but after 50-60 km it just felt pretty smooth & light than earlier & i started to speed up...

Now while coming back i can hear a squeaky sound from right side of the car. I saw oil leak in shock absorber of front right side. May be the sound due to that???

If it is to be replaced what may be the cost & priority?

Should i replace both front suspension & related parts?

Please suggest.....

Regards/ Vaibhav
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PostSubject: Re: what is the best rpm to get the best mileage on 1.5 diesel?   Tue Nov 20, 2012 10:36 am

Hi Vaibhav,
It is better to schedule an appointment with your service center and get the vehicle checked soon.

In case the unit needs to be changed, single replacement should be fine according to me.

Regarding the car feeling heavy initially and later eeling smooth, Yes. This happens in my car as well. Even though the engine warms up to the required temperature (4 bars on the right side of your display screen), when you drive for about 50kms on the highway, the car becomes more free at the speeds you are travelling. I normally call it clearing the lungs of the car Smile.

Regarding your fuel economy calulation
The fuel tank capacity of the Logan is 50L. Normally 8% of this is reserve which is about 4 litres. Since you had 1 bar remaining, let u assume there was 1 litre less of the 5 litres in the bar. So you had 8 litres remaining and effectively covered 980km in 41 litres.

So, your mielage will be 23.3 Litres.

Cheers!
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PostSubject: Re: what is the best rpm to get the best mileage on 1.5 diesel?   Tue Nov 20, 2012 11:49 am

Thanks Surya...

I'll take action on this as early as possible..

Vaibhav
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