when youre not moving, the energy to keep the engine spinning on your caravan must come from fuel delivered to the engine.
if youre coasting, the energy can either fome from fuel, or through the drivetrain causing engine braking
a couple years ago i tried to think through retrofitting an auto stop start feature, long story short, the options are A: to use an injector kill switch and restart w/key or use a starter button or B: buy a car that comes with auto stop start
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