Thinking about trying some GC in my 99 Accord. Currently running M1 5w30 but find the engine noisy compared to the Dino and using around 1 Liter per OCI. Was wondering do the honda's like thick (GC) or thin (M1) oil better. I will be doing a 6 day/7500 km trip in a few weeks so I don't want my MPG to suffer or the car to feel sluggish. Would I notice a dif with MPG switching over to the GC before the trip or should I just stick with the M1?