[header] How to increase fuel mileage on a car [title] Set the car tires to the proper inflation. [step] Properly inflated tires can reduce fuel consumption by up to 3 %. Your tires also lose about 1 psi per month, and when the tires are cold (e.g., in the winter), their pressure will decrease due to the thermal contraction of the air. 
It is recommended to check tires at least monthly, preferably weekly. Having properly inflated tires will also help you avoid uneven wear on the tread.