Answer:
A. Without, worse
Step-by-step explanation:
We need to keep our vehicle with good conditions so that it will be good and give us the comport riding.
In order to keep the good conditions, we need to service our vehicle in a periodic interval.
We need to keep check the oil and change when it is dirty. Checking the air filter because air filter plays an important role in giving good mileage.
Therefore, without proper maintenance, your gas mileage will get worse over time.