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Avoid using DFCO if you can, coasting in neutral is much better at those high speeds. If you are going 60 and use .25 gal par hour idling, you are getting 240 MPG coasting. DFCO means you are using inertia to make that mileage infinite, but you will slow down much quicker than coasting.
If you are very familiar with the terrian, think of it as a roller coaster and where you can pulse and coast the longest or coast more total time. The tactic is dependent on the terrain. Coasting downhill with the engine idling is your goal. When the grades are very slight, pulsing uphill, not hard acceleration but very gradual (uphill) means you can coast downhill all the way to the bottom of the hill. If your downhill speed peak could get you a ticket then you want to reduce your top speed climbing the previous hill.
Think backwards from your top speed point. If your speed increases downhill then you want your peak speed to soon be gone coasting up the next hill and then when you get to the top of that next hill you don'y want to be going so fast that you overspeed on the next coast.
Like a roller coaster that climbs once then coasts through many hills curves and even loops, you want the ratio of pulses and glides to favor the glide, by as great a margin as possible. If you car is mechanically in good shape you should to easily beat highway EPA, but I think once you get to 40, you will hit the law of diminishing returns, however adjusting the "nut behind the wheel" will get you to 40% over EPA. Go 44 psi on your tires, and use the roller coaster strategy.
regards
Mech
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