When to change egine air filter / tire rotation?

It's safer not to rotate the tires. The front pair will wear out first. When they do, move the rear wheels with the old tires to the front and put a new pair at the rear. This way there are always relatively unworn tires at the rear, which minimizes the chances of fishtailing.

Change the filter when it's dirty :_> Seriously, buy another copy of the Scheduled Maintenance Guide (which contains the service intervals) and the Owner's Manual (which contains a bunch of other stuff you need to know). They will save you bother and money.

 

Engine air filter: I change it at 15K mile intervals. When you hold the filter up to sunlight and cannot see light passing through, the filter should be replaced. The interval frequency depends upon the air quality in your area.

Tire rotation: Do you prefer to buy 4 tires at once or 2 tires at a time (at more frequent intervals)? If the former, then rotate. If the latter, then don't rotate. If you want tire rotation but have to pay for it, then I suggest you rotate after the first 5K miles, then move to 10K mile intervals.

 

Scheduled maintenance guide for 07 (probably identical to 08) says:

Check Air Filter at 15k miles; Replace Air Filter at 30k miles

Recommended Rotation interval is the same as the Oil Change interval, 5k miles.

BTW, I replaced Air Filter at 15k, and I won't rotate tires again until I wear out the OEMs on the front (I had to replace an unrepairable tire at 15k so I put a set of new tires on the rear). YMMV.