I used to put 87 gas in my car, but the past two times I put gas I have been using 91. Today I noticed that my car feels a little different. It's hard to explain, but it's like the car drives more smooth. The shifts feel more smooth, etc. It just feels like the car is lighter for some reason.
Maybe I am imagining it? But I know I'm not.
It's really hard to explain the difference, but it is bothering me. Even though the difference is somewhat postive (car feels more responsive, lighter, smoother), I'm still wondering if there is something wrong because I don't think a gas can change the car that much