Highway tractors with 6×2 power configurations have been heralded as an important technology for improving fuel mileage, but fleet owners have been hesitant in selecting the systems because they have a tendency to run through tires more quickly and because diesel is less costly than it was earlier this decade.

A group of nearly 200 manufacturers, shippers, carriers and allied associations has urged members of Congress to pass vehicle weight reform legislation to allow heavier six-axle trucks on U.S. interstates.