Originally Posted by Mike Benvo
Sure, thanks for your question.
There is undoubtedly a gain on 91 octane gas, although it's certainly not as significant as the gain on 93 octane and above. On 93 octane you ran run slightly more ignition timing than on 91, due to the propensity for higher octane gas to resist pinging.
There are many stock cars that actually hit their targets, although some of them may not. This is due to a number of different reasons, mainly fuel quality, and environmental conditions. However, there are some tricks that can be made to the calibration that 'help' the car achieve it's targets faster. You should expect a properly tuned car to achieve higher targets than a stock car, even on the same fuel.
There are also a few other things that can be done, such as slightly modifying the knock strategy which can also help the car achieve it's targeted timing.
I hope this helps.
Mike im located in NY... Any idea as to how can i attain this kind of tune out here?