Determining the correct tire pressure for you car can take a little experimenting to get the right pressure that gives the best mileage in different temperature conditions as well as a ride that you are satisfied with. I have found that my CR-V get 1 more mpg as well as better cornering at this time for year in Portland OR with the tires at 28 instead of the recommended 26. As long as you don't exceed the max psi for the tire, you should be okay trying out different fill pressures. I purchased as small 12V tire inflator from NAPA for 20 bucks and a decent tire gauge and do my own in the driveway. It has been a great investment, one I would recommend to all. It runs off the car's power and can be taken on trips etc... It also includes adapters for bike tires, wheelbarrows etc. It will pay for itself fairly quickly and is so much more convenient that going to the gas station as well as more accurate.