What was the source of the gravitational potential and kinetic energy in the first place though? Fuel is the only energy input. Unless you only ever drive downhill of course...
On a more serious note, there's a raft of published SAE papers available on the topic of fuel economy / emissions reduction that cover coasting strategies in some detail (inc. when they are advantageous and when they aren't). They make for interesting reading, although maybe not as entertaining as internet videos....
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