Use cruise control when possible, such as on long, straight, and rural highways. Department of Energy, the optimal speed for fuel efficiency is 55 MPH, but this may vary depending on the given vehicle. When allowed by speed limits, 55 MPH (90 km/h) is best for gas vehicles–According to studies by the U.S.Also, ensure that wheels are properly aligned. It is best to consult the driver's manual (also usually available online) or the side markings of the tires to find the optimal PSI range. Rigidity in tires allows for greater frictional interaction between rubber and the road, imparting forward momentum.
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