HDi Economy/ 1.9TD mpg
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gwailo
- Posts: 49
- Joined: 01 Sep 2002, 00:51
HDi Economy/ 1.9TD mpg
I have read various post around the internet and have been quite shocked at some reports of some people who have had no success in bettering on the mpg on the old 1.9TD indirect injection engine. Surely something is wrong, pug claim 53ish for the Hdi and about 44ish for the old 1.9TD. Some owners have said they are getting 41mpg combined. Has anyone else read such things, and any thoughts on the matter? will be interested to hear all your responses.
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JohnD
- (Donor 2022)
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TheWorker
- Posts: 120
- Joined: 01 Jul 2004, 01:58
unless you had a computer to help, how do you calculate the mpg?
deviding your milage to the amount of fuel last filled couldn't be right can it? i would have thought it would depend on what sort of driving you do - eg. carefully and not going past 3000 revs or really giving it some to the red line.
the makers would have probably tested cars on an oval circuit at a constant speed to get their figures,not keep changing gears so the engine isnt under strain to get the car moving. the weight may also have some part in it as well.
deviding your milage to the amount of fuel last filled couldn't be right can it? i would have thought it would depend on what sort of driving you do - eg. carefully and not going past 3000 revs or really giving it some to the red line.
the makers would have probably tested cars on an oval circuit at a constant speed to get their figures,not keep changing gears so the engine isnt under strain to get the car moving. the weight may also have some part in it as well.
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JohnD
- (Donor 2022)
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<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by TheWorker</i>
how do you calculate the mpg?
deviding your milage to the amount of fuel last filled couldn't be right can it?
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
Why not? Number of miles covered, divided by gallons taken from one brim full to the next must give an average. Obviously, driving style and type of journey will effect the figure, but at the month end, you'll still end up with an average consumption.
how do you calculate the mpg?
deviding your milage to the amount of fuel last filled couldn't be right can it?
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
Why not? Number of miles covered, divided by gallons taken from one brim full to the next must give an average. Obviously, driving style and type of journey will effect the figure, but at the month end, you'll still end up with an average consumption.
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Brilec
- Posts: 34
- Joined: 04 Sep 2004, 01:53
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by JohnD</i>
When manufacturers post their consumption figures they run their test vehicles under ideal conditions - sometimes on a rolling road. In practice, consumption is usually never as good. <hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
But they will use the same method for all engines. So why do owners not seem to get the same benefit?
Also, since March 2001, the road tax rate depends on emissions, and the HDI engines vehicles are always a lower band than their XUD engined equivalent.
I used to get at best (long journey, fully loaded, cruising 70+) 47mpg on my 405 TD estate. I now have a Xsara HDI estate, and am getting the same so far. But the Xsara is a smaller and lighter vehicle. However I know of others with the same car who are averaging 55 - 57 mpg. Seems there are variables in the HDI setup.
There are so many diverse sensors on the HDI, and they all must have a manufacturing tolerance. For instance, if the Air mass meter were overreading by 10% then the ECU would increase the fuel accordingly would it not?
When manufacturers post their consumption figures they run their test vehicles under ideal conditions - sometimes on a rolling road. In practice, consumption is usually never as good. <hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
But they will use the same method for all engines. So why do owners not seem to get the same benefit?
Also, since March 2001, the road tax rate depends on emissions, and the HDI engines vehicles are always a lower band than their XUD engined equivalent.
I used to get at best (long journey, fully loaded, cruising 70+) 47mpg on my 405 TD estate. I now have a Xsara HDI estate, and am getting the same so far. But the Xsara is a smaller and lighter vehicle. However I know of others with the same car who are averaging 55 - 57 mpg. Seems there are variables in the HDI setup.
There are so many diverse sensors on the HDI, and they all must have a manufacturing tolerance. For instance, if the Air mass meter were overreading by 10% then the ECU would increase the fuel accordingly would it not?