And now... The True M.P.G. Figures

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Aped from The Daily Telegraph.

What a good idea. :thumb:



New MPG database challenges 'wildly optimistic' official figures

Disappointed that your new car can't match the manufacturer's claimed fuel consumption figures? You're not alone – now Honest John has the answer.

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Honest John's 'real life' MPG register aims to reveal the true fuel consumption of cars


A new "real life" MPG register aimed at revealing the true fuel consumption of cars has been launched.


Devised by The Daily Telegraph's Honest John, the new database will challenge the wildly optimistic figures that motor manufacturers are obliged to publish.


The Real Life Fuel Economy Register enables motorists to register the fuel economy they are achieving in their own cars, in day-to-day driving, and the database is broken down into make, model, engine and transmission type.

Each time a motorist enters an average fuel consumption figure the overall average will self-adjust to reflect it. The figures can then be directly compared to official EC figures.

"Different types of driving and usage and the experience of thousands of drivers all average out to give an overall figure that you can reasonably expect to achieve," said Honest John.

The website incorporates software that will bar multiple entries, overly optimistic entries or what HJ calls "other forms of sabotage".



Hoenst John states that EC figures are over-optimistic because they result from laboratory tests carried out to simulate a mix of different types of driving, arriving at a "combined" CO2 emission and fuel consumption figure. But because vehicle taxation in Europe is based on CO2 emissions, manufacturers optimise their engines to achieve the lowest possible CO2 in the tests, even though these might not reflect real-life motoring.

"This gives a correspondingly low fuel consumption figure," says Honest John. "Unfortunately the relevant EC Directives prescribe that this figure and only this figure can be publicised by manufacturers, even though it is unlikely to be achieved by the average driver in real life conditions."



LINK to real MPG's.
 
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As far as I understand it the same thing has been done for years on fuelly and spritmonitor websites.

It's interesting data, but less scientific than the official figures. Large cars are more likely to do motorway journeys than small cars, so comparisons will not be easy to make.
 
Doesn't have mine but then I see:

"Note these only cover cars from 2006"
 
Nice idea, but I get 44mpg from my CLS and my wife gets 32mpg when she uses it. So what is the 'true' fuel consumption?:dk:
We really should have a standardised test which encourages manufacturers to improve 'real world' figures not just low CO2 outputs.;)
 
It doesn't state what the engine size is for any of the figures?!?!
 
It doesn't state what the engine size is for any of the figures?!?!
Good idea, but unless seperate engines are listed it will be about as realistic as the manufacturer figures.
 
Nice idea, but I get 44mpg from my CLS and my wife gets 32mpg when she uses it. So what is the 'true' fuel consumption?:dk:
We really should have a standardised test which encourages manufacturers to improve 'real world' figures not just low CO2 outputs.;)

That's easy, you drive it steadily. Your wife drives it like she nicked it.:D Do you let her take it or go out and find it gone??
 
Good idea, but unless seperate engines are listed it will be about as realistic as the manufacturer figures.

I've used the contact us link at the bottom to state just such a thing.:thumb:
 
That's easy, you drive it steadily. Your wife drives it like she nicked it.:D Do you let her take it or go out and find it gone??

No! I do long trips, she just goes into the city!:doh: I have to force her out of her ML when I need to carry something big...or something with 4 legs...or both!;)
 
Nice idea, but I get 44mpg from my CLS and my wife gets 32mpg when she uses it. So what is the 'true' fuel consumption?:dk:
We really should have a standardised test which encourages manufacturers to improve 'real world' figures not just low CO2 outputs.;)

measuring the Co2 output is valid as low CO2 figures mean high MPG figures. The issue is that the cars can be tweaked to perform well at specific tests, but that can harm the real life consumption as drivers drive them harder to obtain the required performance.

I can only measure mine on a tank to tank basis, but the last tank was 41.5mpg, so not too shabby for a 300TD.
 
I still beat the combined figures. Just as well as £30 for me about 22 litres today and she has an 80litre tank.

I've just had new tyres fitted, and I am seeing a lower MPG given the same miss daisy driving style. The rolling resistance of my last tyres must have been lower.
 
I found my engine size for the Z and the average was slightly lower than we achieve.

Which is good, I can now claim we should drive it a little harder.
 
I still beat the combined figures. Just as well as £30 for me about 22 litres today and she has an 80litre tank.

I've just had new tyres fitted, and I am seeing a lower MPG given the same miss daisy driving style. The rolling resistance of my last tyres must have been lower.
After a week of commuting I've just filled up the car. Brim-to-brim 49 litres / 290 miles. That works out as just short of 27mpg, or 245g/km CO2. The combined for my car is 22mpg or 289g/km!

Also I'm still running on winter tyres (to be fair it was only 10 degrees this morning so it's not desperate yet) and they tend to have more resistance than summers. I'm hoping for a week of commuting to come out as 30mpg one of these days. I've not really done any long journeys in it yet either (25 miles commute).
 
I've used the contact us link at the bottom to state just such a thing.:thumb:

Reply to my statement about it not being engine specific.

Quote
"You're right. That needs clarifying. Be patient. We can only get the bugs out when we are aware of them. Honest John ASK Honest John advisor "
Unquote

I guess we'll have to wait and see.:)
 
Results for the Toyota Prius are interesting.

Nearly 20mpg difference between the "official" claims to the "actual" real world MPG.



Now there's a surprise.
 
Results for the Toyota Prius are interesting.

Nearly 20mpg difference between the "official" claims to the "actual" real world MPG.

Now there's a surprise.

Next they'll be telling us that Newton has been proved right!:rolleyes:
 

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