hey thanks for all the info guys tonight I was nice and set the cruz at 67mph, for 110miles 3 short stops and got 15.9mpg hand calculated 16.4 on overhead, cked my air presure in front tires today and left it at 55psi sounds like I probably need more air in tires. before my 110mile run my fill up was 11.3mpg but there was a fair bit of idleing and goosing it involved on that tank. should I start with a program or air and exaust and whats the best or I should say what should I stay away from for exhaust and programs