Sheepdog, agree with most of what you said, except never try coasting in N, my Dodge must be in N to coast well. Best gains made are with the Nut, but it is different between makes of cars. If Honda don't unlock N coast can gain, my Dodge unlocks if coasting down a big hill, but then engine revs to 3k if driving on cruise which I do 95% of time if the car of the day has it. My auto GM's coast like in N, my manual GM, 5th gear off throttle going down a small Iowa hill that will barely maintian speed is 120 mpg in 5th, 180 mpg neutral coast, plus neutral coast will hold or pickup speed.
The OP is talking GM, and I think with GM auto's set the cruise at 55 and forget. Accelerate hard as you can without reving past 2300 rpm or so since he has the 1.8, start your coast earlier than you think you should and you'll bet EPA combined by 40-50%.
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