Well for me, my "practical" approach to deciding between RON92/RON97/V-Power is simple:
1. In my area, there's only Shell and Petronas. Shell is easier to get to, and I get 2% rebate using my Citibank Shell credit card.
2. No RON92 available, so forget that (although I would be interested to try it out at some point, out of curiousity with regards to cost/KM)
3. Only decision left is between Shell Super (RON97) and V-Power (also RON97).
4. V-Power is more expensive, currently 22.5% more expensive (RM2.45 vs RM2.00).
5. So does V-Power give me 22.5% better fuel efficiency than Super? I seriously doubt there can be a 22.5% difference between two sets of RON97 fuel even with superior additives (I never noticed anything close to 20% difference when using AKI87 vs AKI94 fuel in the US). So on cost per KM basis, Super wins.
6. Next question, will V-Power give me additional performance over Super? Based on what people are saying... it appears likely to have some performance improvement. Although in my old E36, I never noticed any difference when I tried V-Power, but I will give it the benefit of the doubt. So on performance basis, V-Power wins.
7. No major surprises here so far. Thing is, am I satisfied with my E90's performance under Super or do I want additional performance? Frankly, I'm quite happy as it is since under normal daily driving conditions, I have more than enough power to take me to work and back at speeds I am comfortable with.
8. My solution: Use Super 99% of the time, and maybe V-Power 1% of the time (
especially on Club drives, so I can "feel" good and pretend I notice the extra "power", when in reality the "power" is from pressing the accelerator harder and being in DS mode to keep up with all the other UDMs).
