Diesel Tops $6 a Gallon as Truckload Rates Jump 11%

The national average for on-highway diesel hit $6.23 a gallon on Monday, up three cents overnight, with analyst Tom Kloza noting that nearly every US state is now above $6 and more are on the way. Brent crude closed up 2.6% at $107.37 a barrel and WTI up 2.3% at $102.39, driven by intensified Houthi activity in the Red Sea and a Saudi pipeline shutdown after drone strikes. Crude was trading near $72 in late February, before the war in Iran.

The same morning, Cass Information Systems published its August freight index. Truckload linehaul rates were up 11.3% year over year and 0.7% month over month. Shipment volumes turned positive for the first time in 42 months, up 2.1% year over year and 5.6% month over month. Expenditures, which capture rates and fuel together, were up 18.7% year over year.

Cass attributed much of the rate pressure not to a demand boom but to enforcement: capacity that could not meet regulatory requirements has been leaving the market, and the trucks that remain are pricing accordingly.

What this does to an enclosed quote

Fuel and capacity are the two largest inputs in any auto transport price, and right now both are moving the same direction at once.

The fuel math is simple arithmetic. A loaded enclosed rig runs somewhere in the 5 to 7 mpg range depending on trailer, terrain, and load. A coast-to-coast run like Los Angeles to Miami covers roughly 2,700 miles, which is 385 to 540 gallons of diesel one way. Every dollar per gallon of movement is therefore $400 to $550 in trip cost before anything else changes. Diesel is up well over a dollar from where it sat this spring.

Spread across a multi-car enclosed trailer carrying four to eight vehicles, that lands as roughly $50 to $140 per vehicle in pure fuel. Spread across a single-car enclosed move, it lands on one customer.

Capacity is the bigger lever, and it is the one most people miss. The enclosed segment is a fraction of the size of the open market, and enclosed trailers are not interchangeable with dry vans or flatbeds. When general truckload rates climb 11%, enclosed does not simply follow along at the same rate. It has fewer trucks to spread demand across, so it tends to reprice faster and hold the new price longer. There is no pool of idle enclosed equipment waiting to absorb a demand spike.

What to do about it

If you have a shipment coming in the next 90 days, three things are worth doing now.

Book earlier than you normally would. The autumn snowbird migration into Florida and Arizona is already building, and it overlaps with the fall auction calendar. Booking three to four weeks out rather than one week out is the single largest thing within your control.

Ask whether the quote includes fuel, and whether it is locked. Some brokers quote all-in. Others quote a base rate with a fuel surcharge that floats between booking and pickup. In a market where diesel moved three cents in a night, the difference matters. Get the answer in writing.

Treat a quote that is far below the others as information, not a bargain. In a tightening market, an unusually low number usually means the load will sit unassigned until the price is raised, and you lose the time. Our cost breakdown walks through what actually drives the spread between quotes on the same lane.

If your vehicle can tolerate open transport, this is the market where that decision saves real money. If it cannot, our enclosed versus open comparison covers where the line actually sits.

The part that is not bad news

The Cass shipment reading matters beyond pricing. Forty-two consecutive months of year-over-year decline ended in August. A freight market that is growing again is one where carriers invest in equipment and drivers stay in the business. The near-term cost of that transition is higher rates. The medium-term result is a network with more trucks in it.

Rates in this market are set weekly, not annually. What we are describing is a snapshot, not a forecast.