Originally Posted by GnokGnik
It doesn"t really offer a substantial MPG advantage over normal petrol so whats the point?
That is yet to be seen. The preliminary estimates are very low for a reason.... BMW did not want to go through the whole debacle VW just did, VW overestimated and when the official EPA numbers came out they did not jive so VW paid and independent to reevaluate the numbers (Jetta TDI) and test in the real world.... VW got the number they wanted but had to pay a lot for it.
If you take the real world data from the web, UK/EU numbers (not estimated EPA style) and calculate it for the US mile per US gallon, you will be surprised at how good the REAL numbers are (33+) and compare them the real world 335i numbers (~20). To me that is a difference....