First, don't drive above or under pressure. No kidding. If a tire's pressure is too high or too low, it will wear faster on the center or sides, respectively. A good idea would be to fill them with nitrogen. This gas is known to have small volume variations depending on the temperature. Moreover, since its molecules are larger than oxygen molecules, they can hardly escape through the tire's rubber.
Secondly, check your wheels' alignment! Keep in mind that newer vehicles often have adjustments for the rear axle, so don't look only for the front ones. If the wheels are set up right, then the contact surface will be even, and thus there will be less stress on the tires. Check both the toe-in and the camber for both axles. Moreover, if the tires are correctly aligned, your car will get a higher fuel efficiency. Last but not least, the car's handling will be improved. If you have squeaky tires on every corner, then it's time for a check.
Check your tires regularly. Even if you have nitrogen in them, even if the alignment is done, and they never set the thread on a patch of oil, they can still get punctured by a nail on the road and slowly lose pressure. Drive slowly in a quiet area, on dry pavement, and listen to any unusual noises coming from the tires. If one of them has a bump on it due to a pothole and you decided to replace it, change its pair from the same axle as well. Never change one wheel on a side unless you have no other option.
Tire rotation is a must, not a myth! Except, of course, when you have different wheel sizes front and rear. In that case, you can't do anything about it. Otherwise, you can swap them in your driveway. It would be ideal to rotate the wheels every 5,000 miles (app. 8,000 km). Each wheel must reach each end of the car. Don't forget the spare wheel, too, if you have one.
Also keep in mind to check the suspension. A worn-out shock absorber or spring will make the wheel jump, leading to different wear. Moreover, check the tie-rods and bushings. A worn-out bush or joint will affect wheel alignment, which will damage your tire.
Last but certainly not least, driving style. If you're driving too aggressively, then the tire will suffer. Leaving the parking lot in a cloud of smoke or braking at the last moment won't do any good to your tires.
So, how many miles are you doing with your summer tires? Leave me a comment in the section below.