Hey everyone,
On the subject of gas mileage, I was wondering what everyone here with
4x4 V8 CC Daks with 3.55 gears, automatic and 31x10.5R15's are getting for
gas mileage. I'm averaging about 13mpg driving around in 2wheel drive, and
being rather light on the gas pedal. Now that its winter here in Fairbanks,
I've been running around in 4x4 (iced-up roads) and getting about 9mpg. I'm
still being quite light on the gas... I've had to make a few trips to
Anchorage, its a 7hr drive...and every time I've gotten no more than 16mpg
(going 65mph most of the way). Is this normal? Anything I can check? I
replace the air filter every 3,000 miles or sooner, so its not like I have a
clogged air filter... Any ideas would be appreciated :)
-Darren Asuncion
99 Dak CC Sport +, 4x4, V8 auto, 3.55 LSD, Intense Blue, no perf. mods
YET...
> Date: Thu, 16 Dec 1999 18:36:52 -0500
> From: Andy Levy <andylevy@bigfoot.com>
> Subject: Re: DML: Poor Gas Mileage
>
> I've got the same truck. Since I started tracking my gas in June, I've
> pulled about 14.75 MPG, mostly my 13-mile commute. The only time I saw
> 17 was in May, on a 280-mile round trip in one day, 95% highway and
> country roads (pretty flat, no traffic, no radar to evade). Do you
> carry a lot of stuff with you, drive it hard, or use 4x4 a lot?
>
> Have you asked a dealer directly if it'll get covered under warranty?
>
> jbe@micron.net wrote:
> >
> > sorry long, but informative...
> >
> > I have a '99 Dak 318 4x4 auto CC that has always got pretty low gas
> > mileage
> > so through performance mods and such my goal was to increase performance
> >
> > and MPG at the same time. Well after doing TB, cold air intake,
> > headers, catback,
> > ignition, electric fan, and synthetic oil, my performance went up quite
> > abit :)
> > however from day one (when the truck was new) my gas mileage has never
> > ever
> > changed. Always around 14MPG or so (lots of highway), even with all the
> > mods.
> > Now this always bothered me that the mileage has never changed.
> >
> > Today I spoke with a former Dodge engineer about this problem. He
> > stated
> > that the reason some Dak's get 17-20MPG and others get 11-14MPG
> > (or anywhere in between) is a serious mismatch problem between the
> > computer and the O2 sensor. Which is why Dodge has lowered the MPG
> > numbers on the 97-99 Daks ever year they wre produced. He said the
> > problem
> > seems to occur in about 1 out of every 10 Dak's or so. Seems that the
> > O2 sensor
> > is not putting out the correct signal to tell the computer to lean out
> > the engine enough
> > for good MPG.
> >
> > Yikes, I said sounds like mine. What can I do? He said you can test
> > the O2 sensor
> > and make sure the voltage range output is between 0.0 to 1.0 Volts and
> > not something
> > like 0.2 to 0.8. He said getting an O2 sensor to work good is key to
> > helping the problem.
> >
> > Can I take it in for warranty repair? No he said, Dodge dealer will say
> > your mileage and
> > O2 sensor readings are in spec. You will most likely have to buy one
> > aftermarket,
> > and then bitch at Dodge reps for good measure.
> >
> > comments??? added info from anyone????
> >
> > Ja
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