Potential Gas Leak?

Have you washed the back window?

If it's Petrol - it'll smell like Petrol.

 

Or to put it another way, if it does NOT smell like gasoline, it is NOT gasoline.

The exhaust system will "weep" some moisture and there are drain holes for that.
It should only be noticeable on VERY short trips though.

Note: IF you ARE in the habit of overfilling the gas tank.......STOP THAT. It can cause problems.

Edit: That picture shows an extremely SMALL amount of something on the pavement. It might not even be from your car.
Why is the bumper cover pulled loose from the body on that side ??

 

First thing I noticed in your picture is the gap between the bumper panel and body panel is bigger than it should be, as if the bumper was hit and dislodged from the fasteners. Second thing, can you place a plate or bowl in the spot of the drip and leave it overnight so you can determine if the liquid is fuel or just water?

 

My guess would be hydrogen hydroxide. Car engines are basically machines for taking hydrocarbons from gasoline and oxygen from the air, and shuffling them into carbon dioxide and hydrogen hydroxide. They make a lot of both. The HOH is a liquid at normal temperature and pressure.

 

Have you tried lighting that spot on fire to see if it will catch on fire?

 

. Be sure to move the car first...

 

Heh, try explaining that one to the insurance company.

If you're really paranoid about the liquids that drip from the car then do this:

Take a big cardboard box and unfold it so it lays out flat. Stick it under the car after you park it for the night and check it in the morning. See what liquids stain the cardboard.