Personally, I would be quite surprised to learn that the aluminum wheels are heavier than their steel counterparts. "Alloy wheels" came into being because they are lighter, and therefore have less unsprung weight, which leads to better handling and a better ride. Their popularity for aesthetic reasons (now probably the main reason for their being offered) came later.3. The LE uses steel wheels while the XLE uses larger cast aluminum. Could the cast aluminum be heavier? That would be my guess. However you would have to weigh them to know. Significant?