Vw volkswagen mpg figures

AdrianC

It's also worth pointing out how, with high mpg figures, very small extra amounts of fuel can make a relatively big difference to the headline number.

65mpg = 14.4 miles per litre = 69ml of fuel per mile.
60mpg = 13.3 miles per litre = 75ml of fuel per mile.

The difference between 65 and 60mpg is 6ml - a tad more than one teaspoon - of fuel per mile. That's all. One coke can of fuel difference every 55 miles. One wine bottle full of fuel every 116 miles. Save a jerrycan of fuel? That'll take 3,333 miles. A 60 litre tank? Ten Thousand Miles...

motorguy

AdrianC wrote: »

It's also worth pointing out how, with high mpg figures, very small extra amounts of fuel can make a relatively big difference to the headline number.

65mpg = 14.4 miles per litre = 69ml of fuel per mile.
60mpg = 13.3 miles per litre = 75ml of fuel per mile.

The difference between 65 and 60mpg is 6ml - a tad more than one teaspoon - of fuel per mile. That's all. One coke can of fuel difference every 55 miles. One wine bottle full of fuel every 116 miles. Save a jerrycan of fuel? That'll take 3,333 miles. A 60 litre tank? Ten Thousand Miles...

Hence why i dont put my fuel in by the mile, but do so when the 55 litre tank is very close to empty and take it back to the brim each time.



The actual average MPG is slightly over 66mpg as i was averaging the average in the calc at the bottom. You get the correct figure if you tot it up.

almillar

As promised, here's that quote from Audi Magazine a few issues ago explaining what all manufacturers do for the MPG tests.
How are Audi's CO2 and MPG figures obtained?
Audi test its vehicles in a laboratory on a dynamometer (or rolling road). This machine uses floor mouted rollers to enable the car to be 'driven' while remaining stationary - a similar principle to that of running on a treadmill in the gym. The tests are carried out in strict adherence with European guidelines.

Why not drive the car on the road?
It is essential that each vehicle is tested in exactly the same manner. It would be impossible to acheive thison the road due to infinite variations in road and weather conditions and driving styles.

How many tests are there?
There are three: Urban Cycle, Extra-Urban Cycle and Combined Fuel Consumption Figure.

How are they carried out?
The Urban Cycle Test is carried out at an ambient temperature of 20degC to 30degC with an engine that has not been run for several hours. The test consists of a series of acceleration runs, steady speeds, decelerating and idling over a distance of 2.5 miles, during which the vehicle achieves a maximum speed of 31mph and an average speed of 12mph.
The Extra-Urban Cycle test is conducted straight after the Urban test. Around half of the test consists of steady-speed driving, with the remainder consisting of acceleration runs, decelerations and some idling. The vehicle covers a distance of 4.3 miles, reaching a maximum speed of 75mph and an average of 39mph. The Combined fuel figure is an average of the Urban and Extra-Urban Cycle tests.

Why might I not be able to obtain the same results on the road?
Firstly, as it is not practical to test every individual new car, your Audi may produce a better or worse result than that of the similar vehicle tested. Secondly, different roads, weather and driving style may affect the results.

So why are the figures useful?
While the figures are for guidance only, the do enable you to compare the results not only with other Audi models but also with models from other manufacturers, as all EU car manufacturers use the same method for obtaining CO2 and MPG figures.

timbo58

OP -only one way to find out whether your assumptions are correct.

Report them to trading standards and see what answer you get back.
Please feel free to let us know.

Sounds like my car is the only one thats capable of getting it's published MPG, if I want to drive it like 'driving miss daisy' on a longer trip, it's perfectly achievable, and I'd bet yours is capable in the real world of doing more than 53mpg, if you do the same.

JustinR1979

If all else fails, pulse and glide will get the mpg up.

gazter

motorguy wrote: »

Hence why i dont put my fuel in by the mile, but do so when the 55 litre tank is very close to empty and take it back to the brim each time.



The actual average MPG is slightly over 66mpg as i was averaging the average in the calc at the bottom. You get the correct figure if you tot it up.

Thats a pretty impressive mpg. I'm getting about 67mpg on my current tank of fuel in my Outlander Phev. Though of course, long short of the claimed 148mpg....

almillar

timbo58 - what's your car?
gazter - the Outlander PHEV's MPG depends massively on the journey distances. Do 20 miles at a time, and don't go full throttle, and you'll use NO petrol. Sounds like you've had a few 'long' journeys...

gazter

almillar wrote: »

timbo58 - what's your car?
gazter - the Outlander PHEV's MPG depends massively on the journey distances. Do 20 miles at a time, and don't go full throttle, and you'll use NO petrol. Sounds like you've had a few 'long' journeys...

A mixture with lots of city driving. I do 20,000+ a year, so im often out and about all day. I havent done any significant motorway driving, about sixty in total.

mrmot

victor2 wrote: »

My car says I'm getting 99.9mpg when I'm coasting, but I suspect that is below what I'm really getting as it can't display any number bigger than that...
So, basically I can say with all honesty that I can get any mpg figure you like between 0.0 and 99.9.

Your car is getting way more than 99.9 mpg when coasting, as when in the overrun, in gear with no throttle applied the fuel is totally switched off, anything divided by zero is infinite, which is way more than 99.9.

almillar

gazter:

I do 20,000+ a year

Outlander PHEV is not for you then, Mitsubishi would have wanted to sell you the diesel instead, which will acheive better economy on longer (as in more than the 30 mile electric range) runs.
As mrmot says, in a modern fuel injected car, off throttle, in gear, the fuel will be cut off, and the movement on the road, through the wheels, gearbox, into the engine, keeps the engine turning (AKA engine braking) so you're not doing 99.9 or 199.9 but rather infinity MPG. Or you could be using this energy to be charging the battery in an electric car...