I have found in my GC8 I get more K's out of Vortex 98, however I feel I get more performance from BP Ultimate but less K's. It might be a little nerdy but I did a 2 week trial of both driving to work and back and the usual running around just to test it out. Made sure I drove the same each time as much as possible. Traffic being the variable factor.

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....slow and steady wins the race....fark that!!