We all get to know our bricks intimately especially if they are your daily driver and you have driven it for a long time-6-7 or more years. We recognize which sounds are “normal”, which sounds that may seem a bit “off” and of course the performance. We develop an intimate relationship with our bricks. Having said that, I noted as I was departing our home to pick up my wife from her work, the fuel gauge was just a bit too low for me to feel comfortable about making it to our regular feed station, so, I pull into a local Union Station. Mind you, I always use premium fuel-always! I noted that the Union premium fuel was about .30 cents per gallon (which I expected) more than the Costco where I usually fill up. I’ve never experienced any problems using Costco fuel. So I was trying to decide, do I get a couple bucks worth here and then go on to Costco? Nah-I just went ahead and filled him (yes-him) up. Wouldn’t kill me to spend bit more this time. As I left and got on the freeway to continue on to pick up my wife from work, about 6.5 miles away, I noticed the ol’ brick was running just fine, as usual. I exited the freeway and had to go about another ½ mile to her work. Then I noticed it-was I imagining it? I still don’t know but the old boy seemed to run a bit smoother-a bit “perkier”? I still don’t know if it was my imagination. I paid close attention going home, and it really did seem it was actually running just that bit smoother, just a touch more pick up. Only way to know for sure would be to use some fancy gauges that measures things like mileage-power etc. All that being said-has anyone ever noticed a positive change in performance of their bricks if they happened to change to a different brand fuel? I'll still go to Costco, but I sorta liked what I felt after I filled up with the Union fuel.