Re: 5ktq Fuel Economy

[Todd Phenneger <phen9461@uidaho.edu>]

Thats odd,
	In my 4kq (same motor as JT) I get better Gas milage from Higher
Octane.  Although, Medium and High appear to be the same, Low Octane gets
worse Fuel Economy by a bit.
	So on Long trips on the Highway I use Super but around town it
doesn't seem to care what I use.
	L8R

	Todd Phenneger
	1984 4000s quattro / modified/ awaiting Turbo Transplant.
	1985 4000 quattro / Silver / Fixing it Up.
	1987 4000cs quattro / Saphire Metallic Blue/ Girlfriend's
	1996 A6q / Volcano / Dads Car
   *****1985 5kt / PARTING OUT!

On Tue, 23 Feb 1999, Wm. Josiah Erikson wrote:

> Nope : )
> Higher octane gas has LESS power per gallon. It just burns slower, so you
> don't get the preignition knock (well, I guess I should say that it is less
> suceptible to spontaneous ignition under pressure). If your knock sensor is
> constantly backing off the ignition timing because you're running too low
> octane, I guess I could see that you might get better gas mileage by running
> higher octane. In my Rabbit, for example, which has a 10.5:1 motor in it, I
> get better gas mileage and more power out of 91 than 87 (in fact, it really
> doesn't like to run on 87- complains a lot. I have no knock sensor on it).
> But in my QSW, I get better gas mileage from 87 (8.5:1 JT motor)
>     HTH!
>     -Josiah
> 
> Todd Phenneger wrote:
> 
> > >You want to trade?
> > >I get 13-14MPG in the city and 24-26MPG on the Highway (of course I have
> > >a
> > >K24 and 2Bar boost).
> > >If you want to improve your MPG, use 87 octane, should give you 1-1.5MPG
> > >more (maybe).
> > >Avi
> >
> >         Uhh, How do you figure.  Higher Octane allows the motor to run
> > better so you should see better Fuel Economy with the 93 octane.  I do on
> > my car by a 1-2 mpg.  With Higher Octane you get more power per gallon so
> > you use less gas.
> >         Right???
> >
> >         Todd Phenneger
> >         1984 4000s quattro / modified/ awaiting Turbo Transplant.
> >         1985 4000 quattro / Silver / Fixing it Up.
> >         1987 4000cs quattro / Saphire Metallic Blue/ Girlfriend's
> >         1996 A6q / Volcano / Dads Car
> >    *****1985 5kt / PARTING OUT!
>