I used to have a car that needed a little more than 87 to not knock under heavy loads, instead of filling half and half, I filled up when half empty and alternated regular and premium for my fill ups. It worked quite well for me.
I used to have a car that needed a little more than 87 to not knock under heavy loads, instead of filling half and half, I filled up when half empty and alternated regular and premium for my fill ups. It worked quite well for me.