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davcar
Infant
Infant


Number of posts : 2
Registration date : 2010-03-03

PostSubject: petrol costs for older cars   Wed Mar 03, 2010 2:56 pm

Firstly, apologies for what many might regards as a basic question - I am not very knowledgeable about cars!

But isn't it true that many cars become less fuel efficient as they get older.

In the case of my car, a 15 year old Peuegeot 106, I am sure I am going through fuel faster - I am not sure what this could be due to - I had it through the MOT recently , so it cannot be significant tyre wear. I can only imagine it might be due to engine wear or perhaps even a minor fuel leak I am unaware of - I did have a fuel blockage due to a frozen fuel line so maybe its related. Whatever, its a headache!
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Ian_Fearn
Junior
Junior


Number of posts : 52
Registration date : 2009-12-04

PostSubject: Re: petrol costs for older cars   Fri Mar 05, 2010 8:56 pm

Do you know what MPG you're getting?

If not, do a check.

Fill the tank to the brim.

Zero the trip meter on the dash

Run it until the tank is ready for another fill.

Fill the tank again and record the number of litres it takes to fill it.

Record the number of miles you've done on that tank of fuel.

Calculate the MPG as follows:

number of litres to fill x 4.5 = number of gallons to fill

number of miles done on the tank / number of gallons to fill = MPG

From a 1.1 Peugeot 106 i'd expect between 33 and 40mpg in normal running conditions.

Re-post when you've got this info.

Hope this helps....
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davcar
Infant
Infant


Number of posts : 2
Registration date : 2010-03-03

PostSubject: Re: petrol costs for older cars   Fri Mar 05, 2010 11:48 pm

Thanks Ian - that is helpful.

I have been doing a similar thing less precisely - simply watching the level of petrol and it seems to get much less even when only doing a few local journey.

But I do need to do this more precisely as suggested.
Ian_Fearn wrote:
Do you know what MPG you're getting?

If not, do a check.

Fill the tank to the brim.

Zero the trip meter on the dash

Run it until the tank is ready for another fill.

Fill the tank again and record the number of litres it takes to fill it.

Record the number of miles you've done on that tank of fuel.

Calculate the MPG as follows:

number of litres to fill x 4.5 = number of gallons to fill

number of miles done on the tank / number of gallons to fill = MPG

From a 1.1 Peugeot 106 i'd expect between 33 and 40mpg in normal running conditions.

Re-post when you've got this info.

Hope this helps....
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Ian_Fearn
Junior
Junior


Number of posts : 52
Registration date : 2009-12-04

PostSubject: Re: petrol costs for older cars   Sat Mar 06, 2010 10:53 am

Local short running always cripples your MPG but as we all know petrol is rather pricey and it may be that your expectations are too high.

Do you have experience of other cars fuel consumption?
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jadis
Junior
Junior


Number of posts : 39
Registration date : 2009-12-29

PostSubject: Re: petrol costs for older cars   Sat Mar 06, 2010 11:38 am

"number of litres to fill x 4.5 = number of gallons to fill"

I think the equation is wrong here surely it should be divide the number litres by 4.5... not multiply...
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Ian_Fearn
Junior
Junior


Number of posts : 52
Registration date : 2009-12-04

PostSubject: Re: petrol costs for older cars   Sat Mar 06, 2010 4:48 pm

Sorry, you're right, i wrote this in a bit of a rush!

Thank god theres some brains on here Very Happy
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misterspivvy
Junior
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Number of posts : 11
Registration date : 2010-09-03

PostSubject: Re: petrol costs for older cars   Sat Nov 27, 2010 4:07 am

as the engine wears and you get less compression it probably will be using more fuel. Not something I've ever noticed really, as they tend to be worn when I buy them. my volvo does about 25-28 mpg which is about as good as they ever were.
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Macoli
Infant
Infant


Number of posts : 2
Registration date : 2009-07-15

PostSubject: Re: petrol costs for older cars   Mon Dec 27, 2010 3:07 pm

Ian_Fearn wrote:
From a 1.1 Peugeot 106 i'd expect between 33 and 40mpg in normal running conditions.
I'd say that was very poor - the wife's 106 sees 40-55, 45 on motorways.
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