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10-05-2010, 11:19 PM
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Hummer Veteran
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Join Date: Nov 2005
Location: Finland
Posts: 126
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Re: downhill on gear fuel consumption
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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 ...
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Last edited by Hammer : 10-06-2010 at 10:06 AM.
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10-06-2010, 03:47 AM
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Hummer Professional
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Join Date: Feb 2004
Location: Annapolis, MD USA
Posts: 365
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Re: downhill on gear fuel consumption
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10-07-2010, 04:47 AM
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Hummer Professional
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Join Date: Nov 2008
Posts: 261
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Re: downhill on gear fuel consumption
I agree with Hellz, if all fuel was cut off, then the engine will stop. To prove this, try coasting down hill and turn off the key. Your tach will drop to zero and the engine is dead. If "gravity" and the tranny spinning were keeping the motor turning, then it would keep turning when the key is turned off, but it wont.
Now if you have a manual transmission, then it is a different story. Now you have a mechanical link between the motor and tranny, and as long as the wheels are turning the tranny, then the engine will also be turning. Not so with an auto. Other wise you would be able to roll start an auto like you can with a manual. But you can't. Roll a dead auto down hill and put it in drive and nothing will happen.
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2005 H2 SUV - Stealth Gray with Ebony interior - Third row - Exterior tire carrier -
Mirror caps - black bedliner
Roof rack rails - black bedliner
Wheels - Black bedliner on stock wheels
Gas cap lid - still chrome but will soon be black bedliner
Tail light guards - still chrome but will be black bedliner
Grill - Still chrome but will be black bedliner
Hmmmm, is there a pattern developing here?
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10-07-2010, 08:16 AM
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Hummer Professional
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Join Date: Aug 2008
Location: Pensacola FL / Sulzbach-Rosenberg, Germany
Posts: 490
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Re: downhill on gear fuel consumption
If your worried about gas usage you shouldn't be driving any of the cars your currently own buy a hybred smart car or get a skate board they use no gas going down hill. 
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2006 H2 Slate Blue LUX with more chorme, K&N 77 Series Intake, Pirelli Scorpion ATR LT325/55R22, 22in polished chrome rims, Kenwood DNX-7200 w/ Garmin Navi, DVD, Bluetooth, IPOD,Rockford Fosegate Punch 10in P-1 Subs, Rockford Fosegate Punch P-300 amp,7" headrest monitors, Carbon Fiber Dash kit, 17 Flip down Monitor, Borla exhaust.
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