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When it says it raises it 4 points it means from 91 to 91.4, not 95.
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octane boots is a waste of money.
My friend has been modding turbo cars for a while. he had a 1.8t GTI, a wrx, and now has an STI. For turbo cars octane is a big deal for tunning, when you up boost you are upping the compression. LOL go to your tuner and tell them to tune your car for 91.4 oct and see what they say.
For a NA V8 its not that big a factor if your around 10 to 1 compression 91 will be fine.
Only having 91 oct in CA; I filled up with 93 oct one time, and i don't know if it was in my head, but maybe it ran a little smoother... I don't know...
If you want higher octane, buy higher octane gas.