I just got a 1400psi washer and saw on TV last night a guy cleaning his car with it.
I can put on a detergent bottle and spray first at low pressure, then put on the head unit and vary the spray from wide to narrow. Seems great on wheels.
Anybody using one?

yea i used to wash my old 4runner with the pressure washer, just dont be a dumba$$ and get really close to the paint. now the undercarriage thats a different story, you can get closer but again just dont be a dumba$$ and get super close with the nozzle. it does get the dirt and grease removed with less effort, but i prefer the old elbow grease method.

i need to go OCD with my pressure washer underneath my truck one of these days. and a whole bottle of simple green.

the answer is yes. just be careful.

Just don't get too close to the paint. Where I used to work we used a pressure washer to clean postal vehicles and when you got too close you could peel off the paint.

Yeah! The pressure washer is awesome on wheels. Here are some cautions while using pressure washer:
1. Always keep the nozzle at least 6 inches away from the paint. Don't be tempted to get closer to remove a little spot. If you spray directly into an existing chip and you're too close, it can actually chip the paint. 1400psi is not likely going to cause any problem, though.
2. Never use a straight stream (if the pressure washer supports it). Same reason as above, Keep the stream in a "fan" of about 30 degrees.
3. Don't towel dry after washing with only a pressure washer. Even if you use soap, some dirt will remain and you'll end up with dirty towels and swirl marks.
You may check out Pressure Washer Characteristics (http://www.best-pressure-washer-reviews.com/pressure-washer-characteristics.html), It has excellent reviews about the best pressure washers selected on their characteristics.