Diesel's street margin is 0.133 wider over the month at 1.456

The diesel retail-wholesale spread is 1.456 now, up 0.133 over the past 30 days. That is added room between what you buy diesel for and what it sells for on the street. If you move diesel, that is margin you are keeping today that you were not keeping a month ago, so check that your pump price is still reflecting it and not lagging the rack.

Part of why the street side opened up is that the wholesale benchmark fell. ULSD diesel futures are 4.723, down 10.0 percent over 30 days, and they are at the 73 percent mark of their range, so they have come off the top but are still in the upper third. RBOB gasoline is 3.144, down 9.8 percent, sitting near the middle of its range at the 47 percent mark. Both products got cheaper while crude did not.

Crude is the other half of the picture. Brent is 109.86, up 3.8 percent, and it is at the 100 percent mark of its 30-day range, meaning today's price is the highest it has been in the past month. Crude up and products down squeezed the refiner. The 3:2:1 crack spread is 55.15 now, down 13.45 over 30 days, a real tightening of the margin refiners earn turning a barrel into fuel. Refinery utilization is 16.615, down 4.1 percent and right at the middle of its range, so run cuts are not the story yet.

Watch Brent from here. It is pinned at the top of its month and could keep leaning on wholesale product costs, which may pull some of that widened street spread back if the rack catches up to crude before your pump price does.