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Message: <blockquote data-quote="mat6689" data-source="post: 443335" data-attributes="member: 14844">Before change to bm I drove subaru sti v9 and has tried all the RON types. if we were to compare on power, different RON grade does produce different power, and obviously, the higher the better.As per Albundy and Schwepps quoted about compression/combustion in engine block, ignition timing and advance timing are truth. Another thing to take note also, with fifferent RON and additive, ECU tuning can achieve better advance ignition timing, with the right air/fuel mixture and compression, then yield the best combustion and gain the power.With different tunning setting, RON95 might give you the power that you desire.... if the tuning is set to use RON95, you are free to use any RON (or any brand of petro). If the car is set to use RON97, the best is to use 97 and above. of course, you could use RON95 too but the result will be less satisfy. And that's the reason Shell came out with 3 types of petro, As the driver will feel more powerful if the older the car using the higher grade of RON, and hence normal people will comment V-power racing give the best performance. To be frank, V-power do not make significant differnt on turbo car (not sure about 335...)</blockquote>