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You'll really want to check your owners manual before doing any engine off coasting with an automatic transmission. If your manual says your car can be flat towed you are okay to engine off. If it says you can't flat tow, its likely you will damage your tranny over time due to lack of lubrication and pumps not running.
The benefit of engine off is definitly there. If you do a search its been asked a few times and there are some good answers out there. How big a difference really comes down to how much fuel your engine uses at idle. Larger engines will use more. Older and inefficient engines will use more. My Paseo's 1.5L (in current modified state) uses more fuel idling than my Matrix's stock 1.8L engine. Instrumentation is the only way to know this.
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