D5 engine what MPG do you get?

[hamster]

Are people reporting mpg measured at the pump or what's displayed on the trip computer in the car?

My v70 is returning 41-43mpg on mainly dual carriageway/motorway or country road, little time around town. This is measured at the pump at wach fill up. Trip computer shows 46.5 and hasn't been reset for around 8000miles. I don't drive fast, rarely above 80 on motorway, usually around 70.


Is my v70 with roof rails really 8-10mpg worse than an s60? I know it's heavier and less aerodynamic. How much difference do the roof rails make over those that don't have them?

New intercooler fitted last April made 3-4mpg difference. New magnatec oil put in week before Christmas.

[RoyMacDonald]

Originally Posted by hamster

Are people reporting mpg measured at the pump or what's displayed on the trip computer in the car?

My v70 is returning 41-43mpg on mainly dual carriageway/motorway or country road, little time around town. This is measured at the pump at wach fill up. Trip computer shows 46.5 and hasn't been reset for around 8000miles. I don't drive fast, rarely above 80 on motorway, usually around 70.


Is my v70 with roof rails really 8-10mpg worse than an s60? I know it's heavier and less aerodynamic. How much difference do the roof rails make over those that don't have them?

New intercooler fitted last April made 3-4mpg difference. New magnatec oil put in week before Christmas.

Any saloon has better aerodynamics than an estate.

Magnatec doesn't give the best mpg. You get better fuel consumption with a full synthetic.

[V70 Geoff]

I measure my S60 D5 fuel consumption be keeping a record of fill ups and mileage. The trip computers on all the Volvos I have owned have been optimistic, usually by around 8%. The mileometer manages to be very accurate though. The only car I have owned with a 100% accurate MPG display was a Rover 827 Vitesse hatchback and that had a fuel flow meter to give it the info. Heck I have now let it be know that I owned an 827. The shame!!

[Bernard333]

Originally Posted by hamster

Is my v70 with roof rails really 8-10mpg worse than an s60? I know it's heavier and less aerodynamic. How much difference do the roof rails make over those that don't have them?

.

I would not expect to see 8 to 10mpg difference , an average S60 D5 would be about 3 to 4% better than a V70 D5 on fuel and slightly faster on acceleration due to its lower weight but differences between the condition of specific cars could easily cancel this out on an older car . The roof rails will make a very small difference to mpg but over 100k miles you would have spent about £11500 on diesel so if its costing 0.5% of the fuel you would pay an extra £100 in diesel for the benefit of them over 200k miles . Thats my guess and I doubt anyone but Volvo would know the real answer , as far as I can find out they do not publish this information .

Auto express sponsored some tests which Thule spout in their sales spiel :

http://www.autoexpress.co.uk/news/au...thbusters.html

I am not happy with the basis of part of the tests , its based on some poor engineering practice , I do not believe that a 72kg load in a roof box makes no difference to the fuel consumption . If this could be proved by doing proper tests then the effect of roof rails alone would not be measurable but this does not make sense to me .

[RoyMacDonald]

Originally Posted by Bernard333

I would not expect to see 8 to 10mpg difference , an average S60 D5 would be about 3 to 4% better than a V70 D5 on fuel and slightly faster on acceleration due to its lower weight but differences between the condition of specific cars could easily cancel this out on an older car . The roof rails will make a very small difference to mpg but over 100k miles you would have spent about £11500 on diesel so if its costing 0.5% of the fuel you would pay an extra £100 in diesel for the benefit of them over 200k miles . Thats my guess and I doubt anyone but Volvo would know the real answer , as far as I can find out they do not publish this information .

Auto express sponsored some tests which Thule spout in their sales spiel :

http://www.autoexpress.co.uk/news/au...thbusters.html

I am not happy with the basis of part of the tests , its based on some poor engineering practice , I do not believe that a 72kg load in a roof box makes no difference to the fuel consumption . If this could be proved by doing proper tests then the effect of roof rails alone would not be measurable but this does not make sense to me .

Yes it's odd that adding passenger weight makes a big difference but adding cargo weight in the form of a roof box dosn't. The roof box also increases the amount of air the car needs to push out of the way so you would expect mpg to increase with speed.

The tyre pressure results are odd as well. The bike club I belong to tested loads of tyres at different pressures and they all used far more energy at lower pressures. Try riding a bicyle with the tyres fully pumped then at low pressure, you can really feel the difference for yourself.

I suspect the bikes on the back affected the aerodynamics. Interesting they never tested the bike rack and bikes on their own.

Engine oil makes a difference as well. Magnatec dosn't give the best mpg.

[Mck1]

V70 d5 2002 131k 163 (dragon tuning box and Pipercross panel filter fitted) approx 195/200 bhp

On trip computer average = 39.5 mpg @ 22mph

[CJL]

V70 d5 2012 115 (that's one hundred and fifteen miles) 215bhp

Average on trip is 40.3 mpg, but obviously it's early days!!!