You are not not going to see any gains with 87 fuel on a 91 or better octane tune.
Your might be visiting a mechanic early if you continue to run the tuning like this.
If you run lower octane than the program allows, you are causing pre-detonation to the combustion process. Which can cause long term damage to pistons, valves and other engine components.
Do not rev that car to those points until you run the rest of the 87 fuel out on the stock tuning, get some good fuel in the tank and then retune. Then have some FUN!!!
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