Here's something not yet mentioned and a quick cheap fix if this is the problem ... sounds like it might be.
If fuel pressure is right near 60psi then a bad fuel filter will allow the engine to run for a period of time. As fuel is used the fuel pump struggles to push fuel through the filter to meet the 60 psi minimum requirement on the fuel rail. Once you drop below this the injectors will just not fire.
This can also lead to a situation where the car may misfire a few times and then will just not start. This just happened to me last weekend. I was driving about 60mph and then the car just lost all power and died. I got it started briefly and drove at slow speed for about 2 miles home and it died in the driveway. After that nothing.
I changed the fuel filter and it fired up immediately and is now perfect. Read the thread on fuel filters. Take the filter off, drain the fuel and blow into it and you will feel the resistance ... compare to a new one and you will be convinced this may be at least part of the solution.