Here in the Chicago suburbs the price of gas has been dropping like a rock while the price of diesel has been skyrocketing. Is it like this everywhere? Is it just an increase due to a winter mix or something more sinister? I'm seeing an average of $3.69 for diesel and $2.89 for premium gas. Just a month ago the price for diesel was about the same as mid-grade gas. Now it's almost a dollar more than premium. That seems abnormally high to me.