More about saving gas

As soon as you can see you'll need to stop, take your foot off the accelerator and let the car slow down under it's own compression. You'll still have to use the brake (unless you started slowing down way back there, but you won't be using gas to get that last 300 or so feet.

Gas saving tip

To get better gas mileage, check the air pressure in the tires when they're cold, not after the car has been driven. Manufacturer's recommendations are made for cold tires. If you have to drive to get somewhere to add air, check the pressure first, and add air according to that. If you're shy a couple of pounds when the tires are cold, you're still shy a couple of pounds when they're warmed up after driving, no matter what the meter says.