I drive mostly highway and when I load the leaf up with 400 to 500lb of wood pellets or coal I barely notice any difference.
I put a few bags in the floor of the front seat then the rest on the floor of the back seat and on the back seat it's self.
"THE ABOVE POST CONTAINS MISLEADING AND INACCURATE INFORMATION. PLEASE CONSIDER IT OPINION, NOT FACT". -someone who I offended and is unable to produce the facts in question.