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Originally Posted by Hellz
ill take what ever he is having..
more like when you coast, your engine goes to idle as if you were sitting at a stop light. its still on, and still consuming gas. this is where you are seeing the 47 mpg reading, because it is idleing. this is also how people can trick the MPG meter to read better MPG than what they are getting, but you would have to do this ALOT!
your momentum goign downhill is doing nothing to the engine.
your momentum going downhill is still turning your transmission, transfer case. the tranny will shift gears depending on speed.
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actually in my hummer I get better mpg when coasting on neutral so obviously what I said doesnt apply to all cars h2 for excample.
Many modern cars turn off all fuel when the accelerator is not depressed and the engine is turning over faster than idle. Some don't.
Even my old mitsubishi 3000gt vr-4 (600awhp) witch too have transfer case, transsmission and an all wheel drive when coasting downhill on gear I can see that injectors shuts down = IDC 0% and I dont burn much if any fuel at all ...