Hi everyone. Just bought a new 05' ZX5 S for the Mrs. Auto/Air only accesories. Great Car! Overall Ford, good job!Car only has 300 mi. and the gas mileage(city)isn't all that great(22mpg). Will this improve w/breakin'? The OEM tires are Goodyears RSA's. I've come to the conclusion these tires are only so-so. Any thoughs for a replacement tire w/good ride/handling/wet & snow traction? What's w/this 5w-20 Oil? Hate to second guess Ford, but isn't a 5w-30 oil better? I plan on keeping the car a long time and it seems a 5w-30 oil will offer greater summer protection. Thanks. Your thoughts are greatly appreciated!