In short, net profit is the most comprehensive profitability metric, encompassing all of a business's positive and negative cash flows. A company's total assets can easily be found on the balance sheet. The ROA formula calls for the average total assets, however. Because a company's asset total can vary over time due to the purchase or sale of vehicles, land or equipment, inventory changes, or seasonal sales fluctuations, it is important to find the average total for the period in question.
Rolling resistance is the impact the road has on the tires, and how it affects drivability. If you change the features (size and width) of your tires, it will then influence the interaction it has with the road; thus affecting the gas mileage. This is where tire width can begin to influence gas mileage. Many people believe by changing the height of a carâs tires, they can increase its fuel economy.
Having the correct tire pressure is extremely important for getting good gas mileage and the most life out of your tires. Your car has a specific tire pressure that will give the best gas mileage, handling and tire life for that car, and it's written right on the door of the car. That's the one you should follow when filling up. On newer cars, the recommended pressure is most commonly listed on a sticker inside the driver's door.