B6 Passat abnormally high mpg

Moanin

John T Carroll wrote: »

That sounds about right, if you had only 5 ltrs tank remains (warning light on?) this would equate to a consumption of 6.19 Ltrs/100Kms or 45.6 MPG.

Yeah light would come on top refill

RandomUsername

The water temperature sensor is a known issue in bags of that era and a fairly cheap fix. It would be worth fitting a new one as they do bring down the mpg a bit when they get tired.

Sorry to butt in, but I got a 08 Passat last week...1.9TDI. How do I get mpg, fuel consumption etc up on the dash. At the moment, I have the time, temp, total mileage and trip mileage?

John T Carroll

RandomUsername wrote: »

The water temperature sensor is a known issue in bags of that era and a fairly cheap fix. It would be worth fitting a new one as they do bring down the mpg a bit when they get tired.

Agreed, a faulty temperature sensor can cause all sort of fueling problems but the two or three that failed on my VWs just stopped reading, my '00 Bora had two temperature channels in the one sensor, one went to the instrument panel and the other to the ECU, if the former went faulty it had no effect on the ECU and didnt show up as a fault in the diagnostics, if the channel to the ECU failed then the fault showed up in the diagnostics but no where else. I think all VWs from maybe 03? onwards have only one channel so there is a fair chance that you would notice it via the instrument temperature gauge, but yes, its worth considering changing it.
The engine is also possibly running colder than normal due to a faulty thermostat, remember that the temperature gauge will still read 90C even if the coolant is only =or>75C. Its relatively easy to check this but be careful where you put your hands/fingers, start off with a completely cold engine and either let the engine idle or drive off but make sure that you are on a road where you can pull into the side safely. Just before the temperature gauge indicates 90C which is truly only 75C, feel the top radiator hose, try and feel it ABOVE where the expansion bottle vent joins it (if indeed it does) and it should be practically stone cold as the thermostat doesnt start opening until around 85C, it will be very apparent if in fact the thermostat is passing.
Apoligies for being a bit long winded but this just might point you in the right direction for little or no cost.

slookie

slookie wrote: »

Sorry to butt in, but I got a 08 Passat last week...1.9TDI. How do I get mpg, fuel consumption etc up on the dash. At the moment, I have the time, temp, total mileage and trip mileage?

Can anyone help with this?? Driving me cracked.

RandomUsername

slookie wrote:

Can anyone help with this?? Driving me cracked.

If it is possible on your instrument cluster (I'm not sure if it is) It will need to be programmed by vcds a vag diagnostics tool/programme. A good specialist should be able to do it.

John T Carroll

slookie wrote: »

Can anyone help with this?? Driving me cracked.

Daughter has 08 1.4 TSI but instrument display should be similar, will ask her tonight when I see her and pass on any info, if I have any.

groovie

slookie wrote: »

Can anyone help with this?? Driving me cracked.

Is there a toggle on the outside edge of the wipers arm?

Bpmull

slookie wrote: »

Can anyone help with this?? Driving me cracked.

Flick through the menu using the up down switch at the end of the wiper stalk it would be the same type switch used for cruise control on the left stalk.

If it is an extremely low spec it won't have the on board computer although I thought all passats of that year would have it. Basically if the temperature is displayed top right corner it doesn't have on board computer. If temperature is displayed in the centre of the screen it does have it.

Moanin

groovie wrote: »

Is there a toggle on the outside edge of the wipers arm?

It depends on the spec. Is your car the basic, comfort line or Highline model?

redlead

Moanin wrote: »

It depends on the spec. Is your car the basic, comfort line or Highline model?

Only B6 Highlines have this. I have an 07 Comfortline and the trip computer is way more basic than my 02 Yaris Banger

It's the comfortline model. Id say it doesnt have it.

Joe 90

Toyotafanboi wrote: »

a 3dr mk 5golf weighs 1300kgs and a b6 passat 1600kgs so a golf weighs 19% less than a passat, and you claim the worst you've ever gotten from a tank is 50mpg and this passat is getting 38mpg, so a 19% increase in weight creates just over a 24% increase in fuel consumption?

or to put it another way, stick two average weight passengers in a 3 door golf and the fuel consumption increases by a 25%. i am sceptical.

maybe, maybe around town, and i'm aware you may have a better grasp of physics than me BP, but i'm sure you'l agree that while on national/ motorway routes etc and you have gained your momentum it takes very little fuel to keep you at cruising speed so i would not expect this quantity of added weight to be almost proportional to the increase in fuel usage in a situation like this.

by that standard, a passat towing a horsebox with one average horsey occupant :pac: (car and horsebox combined weight of 3100kgs, a 97 ish % increase in weight) would see a 125 ish % increase if fuel consumption, or if 50mpg is the benchmark the car would now be returning -12.5mpg or some **** i don't even know.

Don't forget frontal area as well as weight. Both matter and at a steady speed on the motorway frontal area difference will be important.

John T Carroll

John T Carroll wrote: »

Daughter has 08 1.4 TSI but instrument display should be similar, will ask her tonight when I see her and pass on any info, if I have any.

Her car doesnt display them either as its the Comfortline.

Bpmull

Surly a comfortline b6 passat has a trip computer that reads, l/100km, driving time, range, distance travel, average speed etc.

redlead

Bpmull wrote: »

Surly a comfortline b6 passat has a trip computer that reads, l/100km, driving time, range, distance travel, average speed etc.

No

John T Carroll

Bpmull wrote: »

Surly a comfortline b6 passat has a trip computer that reads, l/100km, driving time, range, distance travel, average speed etc.

I'm quite surprised as well but my daughter says no (as well as numerous other posters here) a 2000 comfortline Bora has all these but I suppose its typical VW, when they finally condenscended to fit a petrol gauge to the old air cooled Beetle it didnt work as it consisted of a cork and a bit of bent wire mechanically connected to the gauge.