Some of the more primitive cars probably do not have DFCO built in, such as the one I'm currently working with. Which is why I'm trying to figure out ways to attempt to retrofit more advanced technology to relpace the old, not so effective controls.
An injector shutoff does sound like an interesting idea. Maybe even tie it in with an alternator kill switch; injectors turn off and alternators turn on while coasting downhill, injectors back on and alternator off when the engine needs to go again.
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