I recently bought a 2001 S40 with 108000 miles. It's my second car (I'm pretty young), and most of my friends are jealous. I have a few minor problems that I could use some help on.

First, my headlights seem to be adjusted too low. I know they can be adjusted, but I can't figure out how to. I think there is a screw?

My gas gage and trip computers calculation of fuel left seems to be erratic after about 1/2 a tank. This is only a nuisance to me since my OCD causes me to want to top off just to keep a full tank of fuel, but is this something I should be concerned about.

I get wooshing sounds when the sunroof is closed whenever I'm driving over 55 MPH or so, and water leaks in at car washes? Is this a quick fix with some oil or sealant?

Thanks so much.