Re: fifth-gear and miles per gallon

["Marc Peterson" <mpeters6@rochester.rr.com>]

Assuming no enrichment is used...

All CIS/CIS-E engines mixed by the air flow meter flap.  If the engine is
running at a given RPM, it is pumping a fixed amount of air though it, so to
my understanding 3000 rpm is the same amout of fuel whether it is 1/2 or 3/4
throttle, the mixture doesn't change based on the throttle position.

This is different on Motronic system, obviously.  They have a throttle
position sensor.

I think the above is right.

Marc
----- Original Message -----
From: "Fry, Larry" <LEF@chem-tronics.com>
To: <scirocco-l@scirocco.org>
Sent: Wednesday, October 31, 2001 4:33 PM
Subject: fifth-gear and miles per gallon


> Hypothetical situation: you have fifth-gear ratio that gives 3800rpm at
> 80mph and it takes 1/4 throttle to maintain that steady speed.
> second hypothetical situation: you have, on the same car, on the same
> stretch of road, a fifth-gear ratio that gives 3000rpm at 80mph but it
takes
> 1/2 throttle to maintain that steady speed.
>
> question: which situation yields the best mileage?
>
> In other words, which influences miles-per-gallon more, rpm or throttle
> position?  Or is it pretty much a wash?
>
> Inquiring minds......
>
> Larry  sandiego16V
>
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