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S80 '06-'16 / V70 & XC70 '07-'16 General Forum for the P3-platform S80 and 70-series models |
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XC70 D5 poor MPGViews : 6355 Replies : 52Users Viewing This Thread : |
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Feb 5th, 2020, 23:05 | #1 |
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XC70 D5 poor MPG
2010 XC70 geartronic 205 D5 currently reading 23 mpg on the OBC. Recently had a boost pipe fixed, drives well, no codes or issues, just drinking fuel. Granted mostly about town, but economy is worse than the old Xc90 I just replaced with this.
It has been suggested that changing the thermostat may help, but since it is costly to replace, is there anything I can check before doing this? What temp should it run at? Anyone else had the same issues? Thanks |
Feb 5th, 2020, 23:20 | #2 |
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Has it been serviced recently? If not, that might be a good place to start with a new fuel filter, air filter etc.
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2007 S80 2.4 D5 (P3) - 110,000 miles 2008 V70 2.4 D5 (P3) - 163,000 miles |
Feb 5th, 2020, 23:41 | #3 |
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Feb 6th, 2020, 06:01 | #4 |
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What tyres are fitted to it? Certain types of tyre can effect MPG. Also it’s worth jacking up each corner and rotating the wheels to check you’ve not got a binding brake. I’ll assume you’re not driving round with a roof box on, but if you were that wouldn’t help MPG.
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2008 Volvo XC70 D5
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Feb 6th, 2020, 07:51 | #5 |
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Has been serviced and made no difference, genuine parts too. Tyres are Pirellis and are not m&s or winter, however I don't believe tyres would make it that bad?
Thermostat argument seems the most plausable? If the car is driven at all spirited it is very low 20's, although it hasn't had a good run of over 40 miles in a while |
Feb 6th, 2020, 08:20 | #6 |
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Most diesels engines are slower to warm up than petrol engines when under a light load, so your car might not hit full working temperature during short journeys. That'll hit MPG.
Having said that, I've also found that diesels very quickly hit working temperature if they're whizzing along at higher speeds. It's also possible that your old XC90 got up to working temperature more quickly because it was a heavier car, and the engine was under a heavier load at all times. (An early XC90 auto that I borrowed once had a very short first gear, which I suspect was needed in order to get that very heavy vehicle moving.) If your thermostat is dodgy then I'd expect the car to either overheat or to take an age to reach full working temperature, even on a fast road. So, what does the temperature gauge say? Others members may offer a different perspective and, as ever, YMMV. (And it clearly does. ) |
Apr 27th, 2021, 10:27 | #7 |
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I have the same issue so am interested in what you find out. I have owned my 2005 XC70 D5 for 6 years and then over the last 2 months we have had a reduction from an average of 40 mpg to 33 mpg with no difference in use, this included long motorway runs??? It has been serviced at home as usual with all filters done but it has made no difference. I noticed it is running slightly noisier on idle when I start up. Only had its MOT 3 months ago and runs cleaner than air (fast pass as usual). It has 133K on the clock. Everything when driving is good and we have a diagnostic box which hasn't given any faults, just had record of issues with brakes which was sorted. Not sure what to check next??
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Apr 27th, 2021, 17:37 | #8 | |
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Quote:
Your not the first and won't be the last...wrong section, try posting this here - https://www.volvoforums.org.uk/forumdisplay.php?f=19 This section is for later cars. Good luck
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2008 V70 SE D5 Auto 185 ...now 205 Volvo Polestar......192k Passed away - 1999 V70 2.5tdi Auto 340632 miles, RIP. |
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May 19th, 2021, 16:53 | #9 |
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When I picked up mine, 6 weeks ago, the readout ( long term) was 33.7 mpg. I think the previous owner must have been heavy footed, as at the moment, on half a tank, it’s reading 46.2. Some local, some m/way. But then I do like to hypermile, it’s fun.
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