Quote:
Originally Posted by casstony
I was under the impression that diesel couldn't match petrol emissions even with the latest anti-pollution gadgets - that's what the whole VW engine scandal was about.
|
That was two engine generations ago. Your information is outdated and patchy. VW tried to meet emissions and economy targets (while achieving advertised power) purely through tuning, and couldn't. Later engines (EU6 and EU6plus) have Selective Catalytic Reduction (SCR) - AdBlue as it is commonly known - to reduce NOx emissions and can therefore use more reliable tuning without the need to "cheat".
The last AdBlue fill up cost me 90c per litre and 10L lasts about 8000km.
Modern petrol engines consume more fuel, emit greater CO2 per km and have higer particulate emissions. The latest emissions standard in Europe calls for Petrol Particulate Filters (PPF) to bring particulates down to the same level as modern diesels.
Quote:
|
Add to that the lower reliability of modern diesel car engines and petrol seems like a no-brainer?
|
I'd love to see where this comes from. Where is the evidence?
My TDI is EU6 compliant. It's the best car I've ever driven. The engine management system constantly monitors exhaust gas temperature (amongst hundreds of other parameters) and limits fuel injection when temperature thresholds are reached (i.e. de-torques the engine) but I've never noticed a loss of power like that. The car achieves 20% less fuel use over the modern petrol it replaced (which was no slouch) yet is 30% heavier (it's a larger car).
DPF re-generation occurs every 250-300km in my car. There is a correlation between the "quality" of regen and fuel economy. After a high-speed highway drive, during which a regen occurred, I noticed an immediate improvement in fuel economy (about 7-8% compared to the long-term average). Regens around town are OK but not quite as effective. Still, that meets my needs well and I'm very happy.