Poor MPG on 1.6 TDi Sport

[garybuttle]

Don't know how Whatcar achieved those results, my 1.6 has now done nearly 19k and have never had less than 52 mpg per week average and thats on mostly fast duel carriage way runs , as the miliage mounts up the average has gone up now at 57mpg per week. The best I have had is 67.3 on an'A'road run of 80 mile s sticking to speed limits.
The economy of mine is absolutely spot on , and have never seen the dpf light.

 

[gaffer1986]

xreyuk, I driven the Ecomotive 1.6 TDI CR Leon and have to say it is a lot more economical than the Ibiza 1.6 TDI CR. I was getting around 10 mpg more from the leon on the same journeys. Same driving style.

 

[nightflight]

The ecomotive versions have a different map for better economy though don't they?

 

[seatleon2012]

i cant see anything wrong with my MPG i got my 1.6 dark grey ibiza tdi 2 weeks ago i commute to work about 25 minutes everyday going to and from work thats 20 minutes motorway and 5 minutes b roads i average about 55-60 on motorway using cruise control when sticking to a constant speed and im averaging about 56.4 today slowly creeping up..to be honest dont use the car for short trips i live 5 minutes drive from my town so i walk it about 20 minutes and only use the car if i want to go on a long drive somewhere and to work but i always make sure i get on some motorway whatever i do.i put 20 pound dieseal in today im on 1/2 tank and it is reading about 320 miles whats left in the tank

 

[Deleted member 74601]

The ecomotive versions have a different map for better economy though don't they?

Not a different map as such, just extended gears. Only gains about 5-7 mpg on the tests.

 

[DrLargePants]

If you look at the mpg that the non DPF cars got, compared to the ones with (yes I know it's a different engine), you have to wonder how much the DPF is to blame for the crap economy.

They fit a DPF to reduce emissions, which in turn reduces mpg, which then means you need to put more fuel in.

So much for being eco friendly.

So very true!

My old and knackered 1.9 PD 100 Golf does over 60mpg on a (long) motorway and about 45mg around town, even hooning it I've never got less than 40 average

Just read up about DPF's today, sounds like a really bad idea to me!

 

[gaffer1986]

I find the gear ratios on the ecomotive 1.6 TDI leon the same as the 1.6 TDI sport Ibiza. Both rev at 1600rpm in 3rd gear at 30mph and 2000rpm in 5 gear 70mph.

 

[DEAN0]

Just read up about DPF's today, sounds like a really bad idea to me!

Completely agree.

The DPF collects the soot and prevents it going out of the exhaust.

Then the DPF does a regen to burn off all the soot - and throws it all out of the exhaust !!!

 

[nightflight]

Completely agree.

The DPF collects the soot and prevents it going out of the exhaust.

Then the DPF does a regen to burn off all the soot - and throws it all out of the exhaust !!!

notsureifserious?

The soot is reburnt to convert more of it to carbon dioxide and stuff rather than spewing out soot which is more harmful to penguins and butterflys/

Which raises an interesting point... The 1.6tdi gets away with only bein £35 a year to tax based on its co2 emissions being really low. But are they that low or is it in effect cheating because rather than dumping loads of co2 out the back in normal use, which is when they'd test it, it "stores" the co2 up as soot, then once the testing has finished it does a regen and produces the rest of the co2.
sneaky.

 

[DEAN0]

notsureifserious?

serious in part but more tounge in cheek.

Your description is more accurate but has the same conclusion.

The DPF is just a way of getting passed the emmisions regulations - i don't believe in the overall emissions of the car it actually does a lot.

 

[gaffer1986]

I quite like the DPF, it stops hazardous gases building up in congested areas; helping city dwellers live longer.

The DPF doesn't store CO2, it stores carbon soot particles and other harmful nitrogen oxides. It combines the carbon soot particles with the nitrogen oxides to make less harmful CO2 & NO2.

Chemistry inside a DPF:

NOx + O2 = NO2
then
NO2 + C = CO & NO
then
CO + NO + O2 = NO2 & CO2

So essentially NOx and C are eventually converted to NO2 & CO2

NOx (nitrogen oxide)
O2 (oxygen)
NO2 (nitrogen dioxide)
C (carbon soot particles)
CO (carbon monoxide)
NO (nitrogen monoxide)

So in actual fact the DPF creates extra CO2, it never stores or reduces CO2.

Modern diesel engines have lower CO2 emissions because of the advanced: ignition timing, valve timing, fuel injectors, combustion chambers, etc. The DPF is just there to convert carbon soot particle and harmful nitrogen oxides into cleaner CO2 and NO2.

Euro 5 emission regulations focus on reducing emissions that are immediately harmful to our health much more strictly than reducing CO2 which is more hazardous to the planet.