"Mortimer" <me@[EMAIL PROTECTED]
> wrote in message
news:u76dnXdti4871r_VnZ2dneKdnZydnZ2d@[EMAIL PROTECTED]
> "Sam the Bam" <samthebam1@[EMAIL PROTECTED]
> wrote in message
>
news:993f6e42-2d59-4ac6-81e2-33f9ede9aebd@[EMAIL PROTECTED]
>> On May 6, "travis...@[EMAIL PROTECTED]
" <travis...@[EMAIL PROTECTED]
> wrote:
>
>>> They coast downhill with the engine off and do not use
>>> compression braking, which adds a few mpg. I've
>>> tested this **** in a non hybrid car, btw, coasting downhill
>>> or on flats versus running against the engine's compression.
>>> You can recover 10% mpg just by aggressive coasting.
>
> How much fuel does an engine use when you are going downhill with your
foot
> off the throttle, using engine braking? I'd expect it to be about as
much as
> with the engine idling.
Most don't use any fuel as the computer shuts the injectors off on decel.
You
can see this on a scan tool by monitoring injector pulse width which will
go
to zero.
Just because the engine is running faster and
> there's a greater throughput of air due to the more frequent induction
> strokes, why should that cause more fuel to be used, assuming you have
fuel
> injection rather than a carburettor?
If you have your foot of the throttle there will be less air passing
through
the engine as the throlle plate will be closed.
>
> Is the fuel consumption the same if you coast downhill with the engine
on
> but the clutch pressed and/or the transmission in neutral?
It would be higher in that case as the injectors would be supplying fuel
to
the engine.
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