Regular unleaded vs Premium gas

[Hack]

So I recently put in 87 octane from Safeway which I think from research is not a top tier gas. Car ran ok but seemed like it had a cold. I read about Shell and how they use more additives than any other company with a total of I think 6 or 7 compared to the average 3 to 4 detergents. So last night I filled up with their top Nitro V power 91 ( all we have around here). Car seemed to wake up a bit. It feels a tad more responsive and overall cleaner healthier sounding engine. I just wanted to see if there was a difference in my opinion. I will be using Shell from now on even if it is $4.30 a gallon.

I've done that same test with multiple tanks of 87 and 91 in my 2015 GT that I daily drove. I never noticed a seat of the pants difference.

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[Smokey613]

I've done that same test with multiple tanks of 87 and 91 in my 2015 GT that I daily drove. I never noticed a seat of the pants difference.

I can definitely tell a difference on my 2015. On 87 it runs fine, just not as responsive as it feels on 93. Midrange torque and on top end is where I really notice the difference. One of my jobs when I was in law enforcement was receiving the new patrol units for our department. We were small, about 100 deputies. The one thing I learned was we could get 10 new units in and there was always one that just ran better than the rest even though all were “identical”. I usually grabbed that one for my use.... rank had it’s privileges. We will likely trade/sell the Mustang in about a year and go back to a truck, but until then it will stay on 93.