RE: Handling at high speed
Yes I think the pavement is a big part of the problem. They put down rough concrete and then take a grinder to take the high spot's off . Leaving the curvy grooves in the road. I did have a Harley and it was really bad riding it on that pavement. I will get the alignment checked anyway . I have over 4000 miles on the car. It is ok till I hit 100. Then feels like on marbles. I put Yokohama Advan S4 size 245/50 /18 on my wifes 300C . That really helped the handling with it . But they don't make 20's . But the shop that mount the tires from Tire Rack checked the alignment on the 300 and it was off a little . And drove much better after .