Shift your weight onto your elbows as you step back with the other foot and place your feet together. Hold until your form starts to fail or until you are no longer able to keep our abs pulled to your back. Step into the ball with one foot at a time. 1  Equipment notes.
For comparison's sake, most modern trucks manage between 5.5 and 6.5 mpg. For most long-haul truck drivers, an increase in fuel economy of 54 percent would equate to a savings of around $25,000 per year at current diesel prices.
We started with two sets of tires in the same size class, namely LT285/70R17 (33-inch equivalent), and mounted them on two sets of OE steel wheels. With tire pressure an mpg consideration, we used a formula that converts the truck's original 245/70R17 factory pressures to the increased volume of the bigger tires. This formula can be used by anyone doing a tire upgrade, and you can see it in the nearby sidebar.