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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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MPG plummet - 2.4t 2001 v70 135KViews : 599 Replies : 11Users Viewing This Thread : |
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Jan 9th, 2019, 16:01 | #1 |
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MPG plummet - 2.4t 2001 v70 135K
Hi,
mpg has always been around 28-31. Recently needed new tyres on the front so I opted for winter tyres now my mpg is at 26.5 and still dropping Recently I had an issue where car was pulling to left, swapped tyres around and solved it, so I opted for winters on the front. there is possibility that the wishbones need replacing. Any ideas? does cold weather have this much of an effect? |
Jan 9th, 2019, 17:10 | #2 |
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Winter always has an effect, but how much seems a bit car dependent. I’ve usually been a couple of mpg off summer during winter months over the years.
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Jan 9th, 2019, 17:25 | #3 |
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I'm inclined to agree with 'Sojournermike', 'benja'. Has anything else changed apart from the tyres? Your normal MPG is similar to my own in a N/A auto car, which I believe is not untypical.
Short runs, ambient temperature, and many other factors can all have a bearing on fuel consumption. It might be stating the obvious, but if your MPG is continuing to fall, might you have a leak in the fuel system? Regards. John.
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Jan 9th, 2019, 20:33 | #4 |
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Don't know.
Perhaps it's "posting a problem" website amplification effect but the Winter blends of fuel have come up a lot this year on all the boards I frequent.....or maybe your upstream oxygen sensor is gone? |
Jan 9th, 2019, 20:40 | #5 |
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I've had the lambda sensor being faulty on my 854 Turbo once. The only thing I noticed was an increase in consumption from around 8 l/100 km to 17 l/100 km or so. About twice as much, but nothing else was obvious.
Error code "Fuel mix too rich" could be read. But cold weather and no pre-heating of the engine does increase the consumption too. Not to double rate, though. |
Jan 11th, 2019, 13:56 | #6 |
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Thankyou for replies.
only 2 error messages (bulb and alarm) I'm pretty sure the tyres are the only thing that changed - my driving involves mostly short journeys but always has. Quick note - i am going off trip comp only - i haven't yet done the pump calcs. but I'd say the rate the gauge is going down is in keeping with trip. Would a leak in fuel system show on the trip comp? does it measure at fuel point of entry to engine or before? |
Jan 16th, 2019, 11:55 | #7 |
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This sounds like my v70, mine pulled to the left too and I saw a slow reduction in mpg. Turned out my front calliper was sticking.
Give it a drive then check the heat radiating off each wheel/brake. Is one noticeably hotter? |
Jan 19th, 2019, 07:34 | #8 |
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Thanks for reply, brakes have been checked afaik. Will look again. A mechanic friend has suggested redex to clean the ejectors. So will do that and see if it changes anything.
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Jan 19th, 2019, 11:34 | #9 |
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At least here in Canada we switch to 'winter gasoline' in the cold season, which is believed to drop the mpg. Winter tires also have more adherence so that affects mileage a little.
Careful driving with winters only on front wheels, not to get too confident and speed past the rear tires adherence. Ask me how I know - loosing the rear end on the motorway is not exactly cool. Braking in a curve or downhill also needs attention.
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Apr 1st, 2019, 07:50 | #10 |
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Just to update this thread.
Car settled at 26.3-26.6 mpg according to computer. I tried redex to clean injectors, no perceptible difference to mpg. I haven’t tried anything else but am putting it down to tyres. Just going to live with it! Ben |
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