My theory is that the suspension was designed for a two person load and with only the driver the springs are not balanced. High pressure in the tires may be exacerbating this.
Without a question, it drives much better with 150lbs on the passenger side. It tracks better and is not as affected by wind or buffeting from passing trucks. I have the sandbags in the rear passenger footwell.
I know lightweight is supposed to be better for mpg, but for commuting an hour on the highway, better tracking is a lot easier on the driver.
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