E270 CDI Diesel Consumption

[smillion]

Never seem to get more than 33 mpg on my E270cdi

Done 72,000 miles with her from new. Occassional long run yields a bit more, but not alot.

 

[Diesel Benz]

Never seem to get more than 33 mpg on my E270cdi

Done 72,000 miles with her from new. Occassional long run yields a bit more, but not alot.

Does the computer mileage match with the calculated figure from fill-ups?

I guess 33 mpg is still right if it is only city driving. If you try 53 mph on cruise and drive 50 miles flat roads, you should get a similar figure as shown earlier, unless the IC computer is calibrated completely off.

 

[smillion]

Is there a way of displaying mpg since ownership? I regularly clear the second screen of my odometer.

Went to London today. 120 miles. Motorway 80% of the distance. Town for 20%, stop start.

Avg speed 42mph.

36mpg.

 

[MrMotul]

Is there a way of displaying mpg since ownership? I regularly clear the second screen of my odometer.

Went to London today. 120 miles. Motorway 80% of the distance. Town for 20%, stop start.

Avg speed 42mph.

36mpg.

This is why I am asking if the OBC is accurate, My Previous E270 CDI's OBC did not show the same figures as my present car, pretty similar to the car above. If there are any Mathemeticians out there that can help (Sorry its a bit too early for me, didnt finish work till 02.30) I have just done 630 Miles on a Completely Full tank of diesel (70 Litre Tank) and it is empty (6 miles left on the range meter) and that is Chauffeur Driving in and around London, although mainly London driving,

Regards,

Terry.

 

[Rory]

This is why I am asking if the OBC is accurate, My Previous E270 CDI's OBC did not show the same figures as my present car, pretty similar to the car above. If there are any Mathemeticians out there that can help (Sorry its a bit too early for me, didnt finish work till 02.30) I have just done 630 Miles on a Completely Full tank of diesel (70 Litre Tank) and it is empty (6 miles left on the range meter) and that is Chauffeur Driving in and around London, although mainly London driving,

Regards,

Terry.

Obviously a lot depends on how empty it really is (is the reserve light on) and whether you brimmed it in the first place.

Let's say you used 65L in 630 miles, that's 9.69 miles per litre = exactly 44MPG. If you really have used 70L then that knocks it down to 40.86MPG.

 

[MrMotul]

Obviously a lot depends on how empty it really is (is the reserve light on) and whether you brimmed it in the first place.

Let's say you used 65L in 630 miles, that's 9.69 miles per litre = exactly 44MPG. If you really have used 70L then that knocks it down to 40.86MPG.

Thanks Rory, Yes, it was completely brimmed and almost empty with the light on and the Range option saying I had 6 miles left, I then went out and it went down to 0 miles as I pulled in and filled up (Yet Again)

So it does look like I am getting around 40mpg, which I have to say, I am very happy with. Can anyone post figures for combined driving of a S320 CDI?

Regards,

Terry.

 

[talltimtam]

It cost me £85 to fill up my E320CDI this week. I am dreading the thought that most likely in a few months the prices at the pumps will have gone up even more and I will be breaking the £100 barrier to fill her up

 

[st4]

I am on a slight thread hijack here, but need some advice as I am calculating the MPG for my E220cdi and a vast difference in its trip and what I am getting for its MPG are coming out.

I filled it to the brim in diesel, in Edinburgh, drove home 70 miles to Helensburgh. I then refilled to the brim and the car took on 4.2 additional litres to rebrim the tank in Helensburgh (in both refills the car really would take on NO MORE FUEL). This works out @ 0.92 Gallons. On that basis the E class did 76mpg (dividing 70 by .92).

The trip read 47.6mpg for the trip. Why the 23mpg error? Is my maths wrong? Is my car really that good on fuel. If my calculation is right should I take it to dealers to get the OBC checked. I expected at worse a 5mpg error, but not a 3rd of the reading.

I was super gentle with it and drove it purely with economy in mind bar an emergency kickdown. i.e. 45-50 on rural roads and 65tops on the Mway.

 

[GeorgeA]

I then refilled to the brim and the car took on 4.2 additional litres to rebrim the tank in Helensburgh (in both refills the car really would take on NO MORE FUEL). This works out @ 0.92 Gallons. On that basis the E class did 76mpg (dividing 70 by .92).

Are you sure you only added 4.2litres to refill when you got home? I reckon the OBC reading of 47.6mpg is about right for a gentle run home as you describe.

 

[st4]

It would take absolutely no more fuel. It was hard enough to fit in any after the £4.50 but it died at £5.02.

I thought 47.6 was pretty good too...

 

[GeorgeA]

It would take absolutely no more fuel. It was hard enough to fit in any after the £4.50 but it died at £5.02.

I thought 47.6 was pretty good too...

£5 is about a gallon and you drove 70 miles. Well 70mpg is fantastic

I suspect that the pump delivery into a nearly full tank caused it to knock off early. Perhaps the pump was faulty. Can't think of any other explanation.

Why not do the test again except this time allow the tank to run empty then fill up and do the sums.

Interestingly I am driving nice and gently these days with the impending fuel shortage and price hike likelihood.

 

[st4]

£5 is about a gallon and you drove 70 miles. Well 70mpg is fantastic

I suspect that the pump delivery into a nearly full tank caused it to knock off early. Perhaps the pump was faulty. Can't think of any other explanation.

.

I suspect you are right, no more fuel would go in and 70mpg does seem suspiciously high. By the end of the run the OBS was giving me a 750mile tank range, I'd done 70 already

I was going to do a near empty to full one but with shortages I daren't until this Grangemouth thingee is sorted out.

This weekend I am off to Aberdeen so will have a chance to try the calculation again.

Being gentle does do wonders for the car.

 

[jeremytaylor]

My brothers E270CDI estate did about 5 mpg better than the E320CDI (I6) estate that I had. If economy is your priority, stick to the 270.

 

[BIGjoe]

Fuel expansion could be the reason, if you set off with on a cold day with a cold tank of fuel, it will have been warmed up by the fuel system by the time you arrived, resulting in an increase in the volume of the reamaining fuel in the tank.

 

[welland99]

Lots of you talk about brimming your tank. I presume that by this you mean you can see fuel up to the brim of the fuel filler pipe?

When I used to do this, if I took out the fuel pump nozzle, /I would see the fuel continue to go down slowly. Where did it go?

Anyway, I read a while ago that when you fill up your car and the pump clicks off, the reason that the pump has clicked off is that it sucked back the fuel that would have over flowed all over your trousers if it continued to supply. So when you want to brim your tank and you stand there slowly filling up those last few tenths of a litre and the pump keeps clicking off, remember thast the pump is sucking back fuel every time it clicks off. Thus your tank is not getting as much fuel as you think and you end up paying for fuel you are not actually getting.

 

[Satch]

So many variables at work that comparisons are difficult but in terms of what improves mpg I have found that a new air filter produces an instant 1.5/2mpg improvement.

Perhaps should not be surprised by that other than how much difference it makes after only 10-12k miles.

 

[Rory]

Anyway, I read a while ago that when you fill up your car and the pump clicks off, the reason that the pump has clicked off is that it sucked back the fuel that would have over flowed all over your trousers if it continued to supply. So when you want to brim your tank and you stand there slowly filling up those last few tenths of a litre and the pump keeps clicking off, remember thast the pump is sucking back fuel every time it clicks off. Thus your tank is not getting as much fuel as you think and you end up paying for fuel you are not actually getting.

That's wrong - the delivery hose has no ability to suck the fuel back.

The cut-off works on a vaccuum principle - once rising fuel hits the sensor then the vaccuum disappears and it clicks off the nozzle.

There are a bunch or reasons why you shouldn't brim the tank - one of the main ones is that in warm weather fuel from cold underground bunkers expands quite a bit so if you fill up very close to home and then leave the car on the drive it can easily expand to the point of overflowing.

 

[flango]

Hows this for Economy

My New Volvo V50 DRIVe 1.6D work wagon did the above under mixed running, It now has 4597 miles on the clock and the long term average over those miles is 60.9 mpg. It has never had anything else in the tank other than Shell Diesel and Millers Diesel Power Sport 4

Even on a very high speed run back from Cornwall it still did over 57 mpg.

All this and £35 per year road tax, what a bargain. The savings pay for running my CLK and holidays :bannana:

 

[st4]

flanaia1-amazing MPG but I so unsuprised by the read out

My mates focus has seen an average of about 65mpg on a run from edin to leeds(he does drive gentle) and his car has the same engine but without the slippery aero of your volvo. Its such a smooth diesel and I can't see why one would have a petrol focus when the diesel is as quiet smooth and economical.

We once reset the trip on his car on the A720 city bypass @ indicated 60mph and drove both uphill and downhill sections and the car claimed an 80mpg average. It dropped to 70mpg by the time we negociated the gorgar roudabout and we were on queensferry road, but they are seriously good engines.

My only downer on the volvo, its not RWD

 

[Dieselman]

That's wrong - the delivery hose has no ability to suck the fuel back.

The cut-off works on a vaccuum principle - once rising fuel hits the sensor then the vaccuum disappears and it clicks off the nozzle.

Agreed, it works on a vacuum venturi system. As soon as the fuel blocks the tip of the nozzle the vacuum is formed so cuts the valve off.