The VW Golf 1.2 TSI has CO2 emissions of 134 for both Manual and DSG versions (the Golf 1.4TSI has emissions of 144 for the Manual and 138 for the DSG version).

The Yeti 1.2 TSI has CO2 emissions of 149 for the manual and 165 for the DSG version. Does anyone know why the Yeti emissions for the same engine are so much higher than the Golf ? I understand that the figures are established on a rolling road test so that wind resistance should have no effect.

All figures from official VW and Skoda web sites.

The VW Golf 1.2 TSI has CO2 emissions of 134 for both Manual and DSG versions (the Golf 1.4TSI has emissions of 144 for the Manual and 138 for the DSG version).

The Yeti 1.2 TSI has CO2 emissions of 149 for the manual and 165 for the DSG version. Does anyone know why the Yeti emissions for the same engine are so much higher than the Golf ? I understand that the figures are established on a rolling road test so that wind resistance should have no effect.

All figures from official VW and Skoda web sites.

I am not sure if "know" is the right expression, but here is a possible reason:

The fuel consumption and CO2 emissions are directly related - more mpg = less CO2.

The Yeti is larger, heavier and has bigger cross section area and higher cv that the Golf and therefore uses more fuel and hence has higher CO2 emissions with the same engine.

Should you not know, then cv is the wind resistence - I believ related to a flat plate of the same area. The Yeti has a cv of 0.37, the Golf probably around 0.34 or so.

Edited 24 March, 201016 yr by Agerbundsen

Drag force due to wind resistance is air density (kg/m*3) multiplied the velocity squared (m/s) mulitiplied by the drag coefficient (no units) multiplied by the projected frontal area (m*2) all divided by 2 to give an answer in newtons. (1/2(rho * V*2 * Cd * A))

The velocity has the greatest effect, if you double it, the drag force increases four fold.

The use of catalytic convertors increases CO2 output as the reactions used to treat the carbon monoxide, oxides of nitrogen and hydrocarbons produce CO2.

As above, you need to check out the fuel consumption figures, also the DSG may be heavier and have different gear ratios.

Lookup of Yeti 1.2 DSG Elegance on Parkers shows a CO2 of 155 for the DSG, vs. 149 for the manual gearbox.

That looks like a more feasible difference, and would suggest that Skoda UK have got the wrong CO2 for the DSG. My guess is that they simply used the MAXIMUM CO2 for band G (151-165).

I should find out for sure in the next couple of weeks when mine arrives.

EDIT: I see that the official government VCACarFuelData website lists the 1.2 MANUAL gearbox as 154:

Edited 25 March, 201016 yr by tarbat

Odd as well is that in other installations of the 1.2 engine, co2 is either the same or lower when a car has DSG ( as per orginal post, and the 1.2 Octavia is the same.)

But in Yeti, co2 is higher with DSG. I wonder why this is?

Czech Skoda site quotes both manual and DSG as 154g/km.

Odd as well is that in other installations of the 1.2 engine, co2 is either the same or lower when a car has DSG ( as per orginal post, and the 1.2 Octavia is the same.)

But in Yeti, co2 is higher with DSG. I wonder why this is?

It could be that the DSG for the 1.2 engine is optimized for a lighter weight car than the Yeti. To compensate for this, the shift programmes could be a little more agressive to maintain good driveability. There must be slightly higher losses in the DSG than in a manual box, and clever programming just is not enough to compensate in a heavier vehicle.

The Yeti is about 100 kg heavier than an Octy Combi and must have 200 kg or more on the more usual 1.2 engined cars like the Golf, Polo, Fabia etc.

It is still very economical and from reports here and elsewhere, seems to suit the Yeti well, particularly if you use the SM locally and don't need the high speed superiority of the larger engines for high speed long distance work.

If your primary concern is CO2 = low fuel consumption, there is always the lowest hp diesel.

I am a totally converted modern diesel afficionado. Both from a fuel economy standpoint, but also from a totally superior driveability standpoint. It is sheer luxury to have oodles of torque, no matter what gear you happen to be in and toodle along the 'bahn at speeds illegal in DK or UK at just over 2500 rpm with lots of reserves.

We received the V5 today for our 1.2SE and the official ('cos that's what they'll tax me :S ) CO2 figure is 149g/km.

It could be that the DSG for the 1.2 engine is optimized for a lighter weight car than the Yeti. To compensate for this, the shift programmes could be a little more agressive to maintain good driveability. There must be slightly higher losses in the DSG than in a manual box, and clever programming just is not enough to compensate in a heavier vehicle.

The Yeti is about 100 kg heavier than an Octy Combi and must have 200 kg or more on the more usual 1.2 engined cars like the Golf, Polo, Fabia etc.

Thanks. That is a great explanation and makes sense.

It could be that the DSG for the 1.2 engine is optimized for a lighter weight car than the Yeti. To compensate for this, the shift programmes could be a little more agressive to maintain good driveability. There must be slightly higher losses in the DSG than in a manual box, and clever programming just is not enough to compensate in a heavier vehicle.

The Yeti is about 100 kg heavier than an Octy Combi and must have 200 kg or more on the more usual 1.2 engined cars like the Golf, Polo, Fabia etc.

It is still very economical and from reports here and elsewhere, seems to suit the Yeti well, particularly if you use the SM locally and don't need the high speed superiority of the larger engines for high speed long distance work.

If your primary concern is CO2 = low fuel consumption, there is always the lowest hp diesel.

I am a totally converted modern diesel afficionado. Both from a fuel economy standpoint, but also from a totally superior driveability standpoint. It is sheer luxury to have oodles of torque, no matter what gear you happen to be in and toodle along the 'bahn at speeds illegal in DK or UK at just over 2500 rpm with lots of reserves.

The manual 1.2 TSI has 6 gears, the DSG version has 7 gears so it is reasonable that fully optimized gearing would favour the 7 speed DSG with a higher efficiency and lower CO2 output. The "problem" could be that the 1.2 TSI is basically underpowered for the Yeti and to achieve reasonable driveability Skoda have had to set up the gearbox for performance at the expense of economy. Otherwise it is hard to see why the CO2 of the 1.2 TSI + DSG in the Yeti's should really be so much worse than in other applications.