Gravity

Driving BC7 SUBARU Legacy LSi US model early this morning realized I the factor that affects on steering response in curving scenery, it is the center of gravity. Fuel tank condition 1/3 to full made completely different transient on steering response. I've reconfirmed the Natural Science Law affects on the same as a fixed wing airplane. So we must pay attention to the provision of experiment and measurement conditions prior to the enforcement. The phenomena differs depending on the mounting position of fuel tanks, at frontal bulk head for VW air-cooled rear motor Beetle and frontal motor with rear fuel tank designs. Probably the position of gravity in combination with fuel tank must affect on axle designing and compliance setting in dynamic balance.
To know this kind of phenomena scientifically, various devices are required, accelerometer, vibration meter and Gyro, etc. they are exactly the same equipments that manufacturer's have in Research and Development department?