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I have a 2006 3.0 auto too.
I'm not to sure about coasting in neutral with the auto trans. I've watched my scan gauge and neutral seems to use 0.05-0.10 gph more when coasting than drive from higher speeds. My guess is that there is a bit more vacuum when coasting in drive, lower map = less fuel. I usually pop it in neutral as it goes under 10 mph. I've only had the gauge for a tank and half though so I don't really have enough data. I will watch it more on big hills in and out of neutral and report back.
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