With all the talk about pinging with 92 octane I thought that would be the last
thing to do -- especially when we're on winter gas now?
In article <4AD65430.7020106@cox.net>, hskr@cox.net (Brian) writes:
>
>
> Also Think about running 89 octane instead of 91 or 92. You will get
> better performance and better mileage with the 89.
>
> Brian Cropp
>
>
>
> Matt Beazer wrote:
> >
> >
> > I guess I should explain - I've been making this same trip every day
> > to work since April and I never got below 12, usually in the
> > 12.5-13mpg range. Most people said that the MP PCM would improve
> > mileage, mine went down by 2-2.5mpg, that's like 15%+. I expected it
> > to be about the same or +1mpg. But as another individual said, it's
> > still learning. It takes me a month to burn through a tank of gas so
> > that isn't helping either.
> >
> > I think I need to take it out for a longer drive at higher speeds than
> > a max of 35mph to get the PCM "tuned in" properly. I'm also
> > considering replacing my O2 sensor as the one in there I'm sure is the
> > original with 137k on it.
> >
> > That and spending a couple hours yanking out fence posts on this tank
> > probably didn't help either... doh. Funny how your wallet taking a
> > hit makes you lose all sense of logic. ;)
> >
> > Thanks,
> >
> > MattB
> > (Still having sticker shock after driving a Neon for 6 years)
> >
> > Ray Block wrote:
> >>
> >>> -----Original Message-----
> >>> From: Matt Beazer
> >>>
> >>> Wow, I hope I didn't fill the tank all the way up last time I filled up
> >>> and reset the trip odometer out of habit... because 182.5 miles on 18.8
> >>> gallons of fuel really sucks for fuel economy with this MP PCM, even if
> >>> my speedometer does read 4mph high at 30mph (8.82% off).
> >>
> >>
> >>> If I take into account the speedometer being off...
> >>>
> >>
> >> Perhaps you're not aware that different speedometer gears are
> >> available to
> >> correct for non-stock tire diameters?
> >>
> >>
> >>> ....that still means I really only went
> >>> 198.6 miles, which is only 10.56mpg (admittedly all short trips, less
> >>> than 3 miles per cold start).
> >>
> >> Help me understand this, Matt. You drive "less than 3 miles per cold
> >> start" and you are blaming an MP PCM for crappy mileage????????????
> >> Do you
> >> really need an explanation?????
> >>
> >> FWIW, my Dak's gas mileage improved when I installed the MP PCM.
> >> However,
> >> I do drive it far enough at a time to get the engine warm and off the
> >> "cold
> >> enrichment" from the PCM. :)
> >>
> >> Ray
> >> http://www.dragtruk.com/ENTRIES/20KM1FD2KWBP.html
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
>
This archive was generated by hypermail 2b29 : Sun Nov 01 2009 - 00:12:06 EDT