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Old 04-08-2005   #1
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Accuracy of MPG readout

Hi Mulipla Forumists.

How accurate do you consider the MPG readout of your Multi?

Has anyone out there been exacting enough to compare the readout with a reasonably scientific series of brim-2-brim checks?

I have just fitted the roofbars & roofboot prior to the holiday trip. Driving around the M25 a couple of times (rush hour, but fairly easy traffic) I'm reading 50.2 mpg (JTD 110).

I don't expect such good figures when we hitch up & tow.

What are your experiences?
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Old 05-08-2005   #2
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Re: Accuracy of MPG readout

Hi all,

Every week my MPG is approx 6 mpg under. Last week for example the computer had 42 mpg, and I actually calculated I was getting 51 mpg, (my son has made a program to calculate this), so the computer on the Multi is a bit under, maybe it is set to the US gallon rather than imperial.

shepherd
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Old 05-08-2005   #3
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Re: Accuracy of MPG readout

That's interesting. I'll definitely carry out some brim-2-brim checks?
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Old 05-08-2005   #4
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Re: Accuracy of MPG readout

Somebody asked this earlier and US gallons were mentioned.
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Old 05-08-2005   #5
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Re: Accuracy of MPG readout

I can't imagine that US gallons is the answer. How many FIATs get sold over there? US gallon is 20% smaller than the Imp one.
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Old 05-08-2005   #6
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Re: Accuracy of MPG readout

Quote Originally Posted by disgusted
Hi Mulipla Forumists.

How accurate do you consider the MPG readout of your Multi?

Has anyone out there been exacting enough to compare the readout with a reasonably scientific series of brim-2-brim checks?

I have just fitted the roofbars & roofboot prior to the holiday trip. Driving around the M25 a couple of times (rush hour, but fairly easy traffic) I'm reading 50.2 mpg (JTD 110).

I don't expect such good figures when we hitch up & tow.

What are your experiences?

Hi...this is an often asked question on the multipla forum.

http://uk.groups.yahoo.com/group/multiplaowners/

My multi regularly says 34/35 mpg and always brim to brim turns out to be 40/42!
Towing my folding camper (900kgs) it regularly returns 38mpg of diesel.
Petrol ones are much, much less!

Moriarty...
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Old 05-08-2005   #7
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Thumbs up Re: Accuracy of MPG readout

Hi again,

I didn't realise the US gallon was 20% smaller. This is interesting, because in the last two weeks my Multi has been 20% under the imperial gallon with my brim to brim checks. I just filled my tank up tonight after shopping and the computer says 38mpg but my brim to brim check says 46mpg, that is a 20% difference. Also Moriarty the mundane is 20% out, as he said "My multi regularly says 34/35 mpg and always brim to brim turns out to be 40/42!"

shepherd
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Old 06-08-2005   #8
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Re: Accuracy of MPG readout

My kitchen jug says that a US pint is 16 Fluid Oz. UK being 20.

So I hope that my 20% is correct.

Aren't Imperial measures a hoot?

I had to quote a heat output in BTU a couple of years ago for a quote, I had no idea how to do this so I called my Pa who is an engineer (rtd).

He told me that 1 BTU was the amount of energy required to raise the temperature of one pound of water (!?) by 1 degree farenheit.

How mad is that?

I am starting a personal crusade to start to quote consumption figures in litres per 100km like the rest of Europe. I'll try to find a comparison table...
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Old 22-08-2005   #9
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Re: Accuracy of MPG readout

Our Multipla ['05 115 JTD] reads 29-33 mpg but does 34-35 mpg. How are people getting 50 mpg !!!!!
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Old 22-08-2005   #10
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Re: Accuracy of MPG readout

It's a modern common rail injection diesel, 29-33 (!!!!!)
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Old 24-08-2005   #11
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Re: Accuracy of MPG readout

On our 2001 JTD we regularly clock 45mpg. We reset for each tank load. Not done a brim to brim comparison. Andy vRS - do you have a heavy right foot? We tend not to hammer our Multi, its not really built to do that kind of thing - or is it??
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Old 24-08-2005   #12
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Re: Accuracy of MPG readout

Easy lift off the throttle pedal, all turbo diesels are very dependent on even the minutest difference in throttle position, a few degrees makes a huge difference in mpg.
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Old 25-08-2005   #13
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Re: Accuracy of MPG readout

My wife drives it most of the time, and it potters most of the time - although it finds itself on our local duel carrigeway a lot and the gearing isn't exactly perfect for motoorway speeds.

I am still impressed though, as i used to have an M3 which did around 25 mpg and my wife had a Volvo T5 which returned around 20 mpg, so the Multi is perfect. Also the mileage is at 3000 ? We go to France tomorrow on a estimated 1500 mile round trip so I will confirm fuel consumption.
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Old 01-09-2005   #14
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Re: Accuracy of MPG readout

Quote Originally Posted by Andy vRS
Our Multipla ['05 115 JTD] reads 29-33 mpg but does 34-35 mpg. How are people getting 50 mpg !!!!!
Do you regularly reset the trip to clear the old mpg data?

I get about 40-42 for commutting, 30 mile round trip with some dual carriageway and some town driving.
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Old 01-09-2005   #15
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Re: Accuracy of MPG readout

I have just come back from Scotland and got the following readings:

On 60.09 litres of fuel I did 616.2 miles with a Multi readout of 39.2 mpg.

Doing the maths that gives me an imperial mpg reading of 46.6 and a US one of 38.8.

Not sure if the mpg readout is across the whole journey or an "at the time" figure though.

Driving up to Scotland on the A74M it was giveing me a readout of around 50mpg, but that soon dropped once I hit the singletrack roads with all the hills and bends.
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