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When you P&G the difference between highest and lowest speed does not need to be so big that air resistance plays a mayor role. The speed would be low anyway. It pretty much evens out.
Below 55 mph the air resistance is way less than the other factors combined.
It is not my invention. P&G is a well-known and proven way to save gas. Check the hypermiling tips.
P&G with an automatic can be quite hard, if you cannot get the tranny in neutral during coasting (may damage the tranny so check the manual). Also you don't want the kickdown on the pulse.
Maybe you can mod the tranny to shift up at lower revs, allowing for slower cruising in top gear and better acceleration without downshift.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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