[200q20v] RE: MPG

Brett Dikeman brett at brettd.dsl.speakeasy.net
Wed May 16 11:26:44 EDT 2001

On Wed, 16 May 2001, Paul R Luevano wrote:

> > Hi all, I have noticed many posts with greatly varying mpg's.  My 91 Avant
> > with 106k miles, Lehman chip, K&N, new TBV and Oxygen sensor will not exceed
> > 24mpg highway, and 17 mpg in town.  Car runs strong and smooth at all rpm's.
> >
> > I would like better mileage, considering that I drive 30k per year, any
> > suggestions?
> What he said. My car has the same mods, and I am getting the same mileage.

Yup.  And you're upset?  Our cars were rated from the factory at 18/22.
If you're getting 17/24, and your car is making +60 more HP, who can
complain? :-)  17/24 is almost exactly what I get(actually, I get a little
more, probably 17.7...I usually squeek just under the EPA city guide.)

>  Each
> time I replaced a component, I expected a chance, but the mileage has stayed
> rock solid.  I also have a full Stebro exhaust (including cats).

Yup.  The Motronic does a nice job of adjusting for things like O2
sensors; if you look at the variables the ECU uses, you can tell why.
There's something like 4 different adaptive values for the O2 sensor alone

> On another note, my H2O temp gauge is non-op.  Is there an order of sensors to
> check?  Like to have a temp gauge, now that summer is here, and I do tow.

Multifunction temp sensor...I can almost guarantee that's the problem.  If
memory serves, it's about $50-ish.  $67 keeps popping into my brain for
some reason.

Bently details how to hook up a resistor to the circuit at the connector
end to make sure the power supply, gauge and wiring are all OK.


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