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Author Topic: Excessive fuel consumption  (Read 1244 times)

Offline johners1949

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Excessive fuel consumption
« on: September 09, 2018, 02:28:56 pm »
Hi all, this is my first post so apologies if i make a complete mess.
We have a Seat Alhambra Stylance 2007 2.0 Tdi (BRT) and the fuel consumption seems to be getting worse,
especially when towing. On a trip to Cornwall from Lancashire in 2015 we managed the whole trip down on a full
tank, (370 mls). Not this year, we had to add extra fuel to reach our destination. The car is serviced every 10.000
miles and I add fuel injector cleaner every month or so. No binding brakes on car or van and no heavy use of the accelerator.

Any advice would be much appeciated.

Offline johnnyroper

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Re: Excessive fuel consumption
« Reply #1 on: September 09, 2018, 03:35:55 pm »
Was the average speed,weather etc comparable between the 2 journeys? How much extra fuel use was there?

Offline johners1949

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Re: Excessive fuel consumption
« Reply #2 on: September 10, 2018, 09:59:58 am »
The weather was quite warm at the end of July so air con was onbut everything else was more or less the same.
We have done the same journey every year apart from two years since we bought the car in 2011, the van is
the same one and we travel light, we don't take anything we don't need and the route we take is the same unless
there are any motorway promlems. This year was the worst for fuel consumption and the extra fuel worked out
at around 20 litres.

Offline johnnyroper

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Re: Excessive fuel consumption
« Reply #3 on: September 10, 2018, 02:00:58 pm »
Would you say air con was used more this year due to the high temps in July? If so on a long journey that could cause it as air con can increase consumption by up to 20-25%

Offline johners1949

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Re: Excessive fuel consumption
« Reply #4 on: September 10, 2018, 04:22:08 pm »
No trips away then until temperature drops below ten degrees, as far as I am aware hot air costs nothing ?.

Offline brianh

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Re: Excessive fuel consumption
« Reply #5 on: September 10, 2018, 07:06:24 pm »
The heating function just uses engine heat, so would use less fuel than the air con working hard in hot weather to keep it cool (the fan itself would add a little, but not enough you'd really notice its insignificant). You should be able to switch the a/c function off though - I think using econ if you have the climate control does this. Depends how much the heat/noise with the windows open bothers you. A low charge on the A/C will also make it work harder if its running low on gas, you'd usually start to notice this if the performance of the A/C is progressively getting worse (not getting as cold).

The controls may be slightly different given you have a late mk2 Alhambara, but in any case you should be able to disable the A/C from working somehow with the controls, which would allow you to monitor and see if there is any difference.

Only other thing i can think of is if the clutch (assuming its a manual) is slipping slightly, though would expect you'd have noticed if it was.

Offline johnnyroper

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Re: Excessive fuel consumption
« Reply #6 on: September 10, 2018, 07:27:40 pm »
It’s 6 of one half a dozen of the other really.

Air con on uses more fuel powering condensor fan and driving compressor.

Having air con off with window open causes more drag so again it uses more fuel.

I don’t buy in to this use air con until cool and switch off then back on when it warms up  until cool again. In my opinion the air con will work harder to cool the cabin down and then does the same to re cool after it warms up again. If air con is left on to cool cabin then fan speed turned down to maintain the temp it will use less fuel as there is less demand on the system.
I personally leave my air con on all the time and control on temp setting and can speed so it maintains the temp thus reducing the compressor duty.

Offline brianh

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Re: Excessive fuel consumption
« Reply #7 on: September 10, 2018, 11:31:27 pm »
I'd agree with you there, but the usage seems a bit high, may be as simple as the aircon needing a recharge as its low and working harder than it should be. Though it may just be down to the hotter weather as well, real way to tell is try the same run when its a more reasonable temp and compare. I leave mine set on as well on the Galaxy when using it and just adjust it to suit.

 

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