To the OP, no. A new muffler/pipe, even is sized extremely small or
large, will not cause a 3-4 MPG change in fuel economy in a car that
gets 19-24 MPG. This is way too large a change for such a swap. There
are certain years of Max that have a stock muffler (stamped "Calsonic"
on my car) which has a flap that opens at 2,000 RPM or so. I have seen
this replaced on several Maximas with an open-style muffler with no
perceptible changes.
Look elsewhere in the car for your fuel economy issues.
BTW, fuel economy numbers are very erratic in the short term. Try to
average economy over multiple tanks to get a better MPG number. This
will even out any variations such as: batches of bad gas you might have
gotten, incorrect pump meters, city driving vs highway, ambient
temperature, etc. All of which can really vary your mileage.
In article <pan.2008.01.02.17.20.11.190868@[EMAIL PROTECTED]
>,
pgg <papaNO_SP_AMgordygrapes@[EMAIL PROTECTED]
> wrote:
> A couple months ago, my 2000 Maxima with 68,000 miles start making
> terrible clunking noises from the muffler area.
>
> My head wasn't on straight that day and I took it over to Meineke. A
pipe
> was rusted out and hanging...they said even though the original
stainless
> steel muffler was fine, they had to replace the muffler to replace the
> connecting pipe. I said "fine".
>
> I know...dumb move in hindsight and I wish I would have taken it
elsewhere.
>
> Well the Meineke muffler was $220 or something like that and looks/works
> fine.
>
> However I swear I get 3-4 MPG less than I used to. Possible? I also
got
> the MAF sensor replaced in the same time period...
A MAF sensor replaced, for a good one I assume, should only *improve*
mileage from a deficient number to the normal number. What mileage do
you get, exactly? A MAF bad enough to chop 3-4 MPG ought to throw a
check engine light.
--
Oil is always 15 years from running out, the oceans are always 10 years
away
from rising 10 feet, and the internet always has only 3 years left before
it
runs out of capacity. Color me skeptical.
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