Cruise control is a good tool with an automatic. I find the sweet spot for a 3.8 liter Dodge Caravan to be about 42 to 44mph, just fast enough to keep it in highest gear. On hills, I disengage cruise control to just get over the hill and coast down. I have not tried putting it in neutral on the way down, it seems to freewheel pretty good on downhills as long as you turn off cruise control.
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