I drive by a multitude of gas stations on my brief, 4-mile commute.

This past 10 days or so, I've noticed something curious...the price of self-serve regular has dropped by almost a dime, from $2.99 to $2.91 in recent days.

But the price of the mid-grade gas has remained flat, at $3.05 for about the past 3 weeks.

I wonder why that is?

I do ride my bike in the good weather, I've got a bike trail that goes virtually door-to-door. But I am in Boston, and it's rained most of the past 5 weeks or so. yeesh.