Quote:
Originally Posted by herberpower
Do not turn off the engine to use less fuel if you leave it in neutral. The power steering and brake assist is lost.
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Not so. First, even with the engine off, you should have enough reserve vacuum for several brake applications - plenty of time to start the engine again. Second, with any car (or even largish truck) you do not need power steering at highway speeds unless you are extremely weak.
But the big flaw here is that if your car is at all modern, it will have DFCO, which means that it will use no fuel while decelerating/coasting in gear, but will use fuel if it's idling in neutral.