No, it does not. Any gain you feel is imagined.I now run only high octane fuel, but last winter I tried running 87 octane fuel. I didn't notice a performance difference, but my average MPG went from 23.8 to 21.5. So I went back to 93 octane and my fuel mileage went back up. I didn't know about the fuse pull, but I'll try that.
I do notice a performance gain when I put the car in "Competitive Driving Mode". Dose switching to the competitive driving mode force the car into the high octane fuel map or??????
Perhaps your car never had regular gas in it. I did the fuse pull and it did nothing either. But again, perhaps mine never had regular either. And some people have said that some of the LS3 equipped Camaros don't go into a limp mode with regular gas. I've heard that it is mainly in the L99 equipped Camaros. But it has even been seen on the dyno...some cars made significantly less hp/tq in limp mode. Once the ECU was restored, it made what it should have made in the first place. It works.Was for me. Didn't do much of anything. Even Chevy tells you that you won't notice much of a difference between the octane tables.
I refer to it as "limp mode". Didn't mean to throw you off with that term. As far as what people "feel", that is all subjective. Some people put higher octane gas in 4 cyl cars that require 87 octane and swear they gained 25 hp. However, if several different people from all over the country on several different websites are all saying the same thing, then it is only wise to trust that there may be some truth to it.It doesn't go into limp mode, it simply retards the spark timing so that the car will run safely without knocking on regular gas (87 octane).
As for what people think they feel, I'll point you towards the numerous people that installed spiral or "tornado" intake spacers/throttle body plates and said they produced amazing amounts of power gains for their cars when in fact they did nothing at all.
And for the dynoed results of the power gain, did they let the car run for an hour or so and let it relearn the settings, or did they just dyno after they reinstalled the fuses? If they did the latter, it may have produced high readings but only because the tune for the car hadn't had time to "settle in". The computers in these cars are funny; they requires time after you pull fuses for the computer to relearn the high octane tune. Or any tune for that matter.
Beleive it or not it makes a difference..Man this placebo effect really gets some people....