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I think it depends a lot on the car. My Malibu seems to shift back into gear fine even at highway speeds. Also, idle is higher when in gear, ie, in park or neutral the TPS will be 7 clicks open, in gear it will usually stay 10-13 clicks open. Playing around the other day waiting in line at the border crossing I got
Idle, in gear, AC on - 0.51 gph
Idle, in gear, AC off - 0.43 gph
Idle, in neutral, AC on - 0.41 gph
Idle, in neutral, AC off - 0.29 gph
Looking at that tells me there could be some significant fuel savings coasting in neutral, especially with turning off AC.
But like everyone says, every car is different.
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