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.
Speeding, aggressive and jerky driving can reduce gas mileage as much as 33% on the highway and 5% on city streets. A flashing check engine light indicates a problem that is currently happening and requires immediate attention.