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Burn & glide should offcourse be combined with DWB, driving without brakes. The basic concept is that using the throttle is no sin, in that your expensive fuel is traded for the forward motion you need. (B&G only makes that conversion more efficient) Every time you use your brakes (or engine braking) to reduce the speed is a failure! Any braking is a wasteful conversion of forward motion and intertia to heat. Regenerative breaking in electric vehicle will reduce the energy penalty, but always come with a loss in heat somewhere in the system.
Driving without brakes is the only 100% lossless way to keep speed down when needed! Check out the basics of speceflight, that's where the true ecodrivers are!
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