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Old 04-15-2011, 08:19 PM   #5 (permalink)
bestclimb
Smeghead
 
Join Date: Oct 2009
Location: South Central AK
Posts: 933

escort - '99 ford escort sport
90 day: 42.38 mpg (US)

scoobaru - '02 Subaru Forester s
90 day: 28.65 mpg (US)
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I would not EOC a carbed vehicle. The key just shuts off the spark. The momentum of the engine pulls it through a couple more intake strokes, sucking fuel (the same amount of fuel as a couple intake strokes while idling)into the engine. This can put some extra fuel into the cat, and dilute the oil on the rings. Others dissagre and feel the heat in the engine will evaporate the fuel and it will not be a solvent to the oil . I do not know which way for sure but my fuel injected cars get EOC and my carbed vehicles get neutral coasted to 15mph and brakes the rest of the stop (ideally)

When you start it do you have to pump the throttle? If so you are squirting a bit of fuel in to get the thing running again. As much as you would have used idling? Depends on duration of the stop.

The gain or loss of 3 MPG in the first tank you try it in is not necessarily indicative of it's success. If you are willing to try it for a few more tanks it may pay off. I know In my case EOC is good for about 5-10mpg improvement, but I am fairly aggressive with the EOC.
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