Wheel Mis-Alignment can cause the life of your tires to decrease by as much as 50% or more. Properly aligned tires need to be parallel to one another and perpendicular to the road surface. Improved Gas Mileage (MPG) is also a benefit of proper Wheel or Tire Alignment due to the extended life of the tread of your tires. Big O Tires of Arizona recommend aligning your tires once a year for optimal performance unless mis-alignment is apparent.