Quote:
Originally Posted by 99metro
Just my opinion...
I have heard lots said about fuel cutoff when in gear and the throttle off. I have a hard time believing that the fuel is stopped completely. This would mean the engine is rotating with just the spark plugs firing.
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It stops ignition too. My car will DFCO. The RPM's go up when I drop a gear, and then there is a little "blip" and at the same speed, they drop by about 300 RPM. Once it's down to ~11 RPM, the tach suddenly freefalls to about 400, and then bounces back up to 1400 or so.
Quote:
Originally Posted by jimepting
Incidently, neutral engine-on coasting probably delivers worse FE than engine-on coasting in gear on most modern cars. As mentioned earlier lots of newer cars will go into fuel cut-off when deaccelerating in gear. Go to neutral and you are stuck with engine idle consumption if the engine is on.
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DFCO does produce better mileage in the short run...but that's the thing. It's SHORT. Glides at least for me are about 1/3 to 1/5 as long as coasting in neutral. So yes, I'm getting 9999 MPG when in DFCO, but only for say 200 feet, instead of something like 150 MPG for 1000 feet.
I hope that clears some things up?
