Well sorry to disappoint but this is not what you're thinking. I've got a 15 GS and I'm having an issue with the car drifting to the right on mainly just the highway even when there is no crown. It seems like anything under 60 it's fine but over it starts to drift..almost like it thinks it's centering itself 2° to the right. Tire pressures are all equal at 35 and passenger outer tread has the slightest feathering to it. Anybody experience similar characteristics of the sort?

 

Has the alignment been checked? Also, a dragging brake caliper can cause it to pull. What happens when you brake moderately? Does it stop straight or pull a bit to the right?

 

Have not had the alignment checked yet but did have the tires rotated with no change. Braking does not make it pull to either side...but when driving on the highway any wind gust or passing by larger vehicles upsets the car so I'm constantly correcting...but anything under 60 it seems fine.