Let me correct a few inaccuracies here.
Euro 2 is bad only because it spews out sulphur to the atmosphere through your exhaust. From the engine's point of view Euro 2 is better than Euro 4 because sulphur acts as a lubricant and makes the engine run smoother. Biodiesel has about 5% less power than regular diesel. So B5 will have about 5% x 5% = 0.2% less power than regular diesel.
So in short B5 biodiesel should not produce any power or consumption differences.
What I have done is to test Euro 2 (mostly Caltex, some Petronas), B5 since the original launch in June (many tankfuls of Petronas + 1 tankful of Shell) and Euro 4 (yes I drove to Singapore and paid double the cost to refuel several tankfuls with Euro 4 diesel, mostly Caltex, 2-3 tankfuls of Shell). Consumption based on Gas Buddy on my iPhone is not significantly different. 0-100 speeds based on PocketDyno is roughly 7.1-7.4 seconds depending on the road, also about the same. Engine smoothness which is subjective is also no different, I find more differences between Shell and Caltex in this regard, Caltex is far smoother.
Again my own experience with actual fuel and actual data (I'm an engineer, what to do
). In my opinion B5 is there to save money for the govt, no big difference in performance/consumption.
