[MSCW list] Hi Mileage RX-7 gas mileage

Rich ratedx_7
Wed Jun 11 19:38:46 CEST 2008


Yeah, something is definitely wrong with those numbers. My red 85' that was far from stock (13B SP 4port, 48 IDA Weber, 2.5" exhaust, etc...) that I always drove like a bat out of hell, produced an average of 20+ MPG with a combination of City & HWY driving. Back when $10 bought close to 10 gallons of gas (our kids will never believe us) I always got any where from 200 to 220 miles between fill-ups.

Now that I remember a few of my rotary friends were impressed when I used to tell them that, hmmm... now that I think about it, I'm wondering if those numbers were freaks of nature and not the norm?

-Rich

--- On Wed, 6/11/08, mscw-request at mscw1.com <mscw-request at mscw1.com> wrote:
From: mscw-request at mscw1.com <mscw-request at mscw1.com>
Subject: MSCW Digest, Vol 34, Issue 10
To: mscw at mscw1.com
Date: Wednesday, June 11, 2008, 12:00 PM

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-------------------------------------
******  MSCW List Serve Digest ******

Today's Topics:

   1. plastic antennna mast (JBRERX7 at aol.com)
   2. Hi Mileage RX-7 gas mileage (rem4020 at aol.com)
   3. looking for email address of (Barry)
   4. Re: Hi Mileage RX-7 gas mileage (Bill)
   5. Re: Hi Mileage RX-7 gas mileage (Bill)


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Message: 1
Date: Tue, 10 Jun 2008 20:43:30 EDT
From: JBRERX7 at aol.com
Subject: [MSCW list] plastic antennna mast
To: mscw at mscw1.com
Message-ID: <c8f.29e84a1b.358079b2 at aol.com>
Content-Type: text/plain; charset="us-ascii"

 
In a message dated 6/9/2008 12:02:50 PM Eastern Daylight Time,  
mscw-request at mscw1.com writes:

has  not
worked.? I can hear the antenna motor when I turn the radio on and off  but I
can?t get anything to grab the rack and pull it  down.



it reads like the plastic toothed part of the antenna mast lead is broken,  
it happens in high mileage cars.
 
the replacemen part is the exterior antenna and the plastic toothed lead  
that coils inside a housing which is attached to the antenna mast motor.
 
its a pain to remove, replace and re-install; i've done it on rx-7s and 
626s 
 
best bet is to find a fellow miata/mx-5 owner who has done the replacement  
before and have them assist
 
good luck
 
regards
john becker



**************Vote for your city's best dining and nightlife. City's
Best 
2008.      (http://citysbest.aol.com?ncid=aolacg00050000000102)
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Message: 2
Date: Tue, 10 Jun 2008 15:00:41 -0400
From: rem4020 at aol.com
Subject: [MSCW list] Hi Mileage RX-7 gas mileage
To: mscw at mscw1.com
Message-ID: <8CA9943697EECE7-918-17F0 at mblk-d23.sysops.aol.com>
Content-Type: text/plain; charset="us-ascii"

What is the conventional wisdom on the gasoline mileage to be expected from a
1985 RX-7 with 140,000 miles on it?? My mileage is ~12 mpg and I am wondering,
given its a small car, whether is some one thing that I should look for to fix
to raise the mileage to a reasonable level.? I am assessing what to do with it
in the age of $4 gasoline.? 
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Message: 3
Date: Wed, 11 Jun 2008 00:01:37 -0400
From: "Barry" <grinin1 at verizon.net>
Subject: [MSCW list] looking for email address of
To: <MSCW at mscw1.com>
Message-ID: <004a01c8cb77$d8fe7280$6700a8c0 at user15db4baa09>
Content-Type: text/plain; charset="iso-8859-1"

There use to be a club member that had a really nice looking vintage red NA
Miata. He has since moved. Michigan I think. He . had a quilted cover on the
transmission tunnel, Nardi wheel, KG WORKS instrument panel and supercharger.
If anyone knows who Im talking about I would like to have his contact info? I
believe his address ended with aol.com. 
I want to ask him a few questions.
I appreciate your help 
Thanks
Barry Silverstone 90 Miata
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Message: 4
Date: Wed, 11 Jun 2008 09:48:03 -0400
From: Bill <mscw at stuart5.com>
Subject: Re: [MSCW list] Hi Mileage RX-7 gas mileage
To: MSCW at mscw1.com
Message-ID: <20080611094803.5gl165gzmsc08os0 at www.stuart5.com>
Content-Type: text/plain;	charset=ISO-8859-1;	DelSp="Yes";
	format="flowed"

Quoting rem4020 at aol.com, 06/10/2008:

> What is the conventional wisdom on the gasoline mileage to be expected
> from a 1985 RX-7 with 140,000 miles on it?? My mileage is ~12 mpg and
> I am wondering, given its a small car, whether is some one thing that
> I should look for to fix to raise the mileage to a reasonable level.?
> I am assessing what to do with it in the age of $4 gasoline.?

Gasoline is still cheaper than bottled water. :)

That mileage seems low. Unless you are doing nothing but stop-and-go  
driving, you should be getting higher. It's been a while since I've  
daily-driven an FB (though I will again), but I seem to recall  
averaging 18 MPG in mixed driving. I think I still have the logs on my  
bookshelf. I'll look this evening.

With 140,000 miles on that engine, it's just entering it's prime.  
There are some problems that develop that can kill your mileage. Does  
everything work and does the car drive like it should?

Have the catalytic converters ever been changed? If they are original,  
the first one has certainly disintegrated and blocked the second one.  
Both should be rodded-out and completely emptied, including the metal  
mesh that holds the catalyst in place.

The third (main) catalytic converter will probably be OK if the first  
two were there. If they were empty, then the third cat may now be  
plugged. If it is and you live in an area without tailpipe tests, you  
can rod that one out too. If you have to pass emissions, replacement  
main cats can be had from Mazda specialists for about $250.  
(http://rx7.com/store/rx7/saexhaust.html)

It's also useful to make sure that all the vacuum lines are in-place  
and that all the mechanisms on the carburetor are working correctly.  
If the car starts OK and runs well, it may be fine, but since the carb  
controls the amount of fuel you use, it's the prime suspect in  
excessive consumption. A stuck choke or float can raise consumption  
quickly.

Finally, has the maintenance been kept-up? Fresh plugs, wires, cap,  
rotor, and air filter can make a surprising difference if they haven't  
been changed in a while.

Good luck!
  - Bill
    SRX7 #77 & #79               Go Racing NOW!
    Forest Hill, MD            http://SpecRX7.com/





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Message: 5
Date: Wed, 11 Jun 2008 10:29:48 -0400
From: Bill <mscw at stuart5.com>
Subject: Re: [MSCW list] Hi Mileage RX-7 gas mileage
To: MSCW at mscw1.com
Message-ID: <20080611102948.c8xpyq88lwsskgc8 at www.stuart5.com>
Content-Type: text/plain;	charset=ISO-8859-1;	DelSp="Yes";
	format="flowed"

Quoting Bill <mscw at stuart5.com>, 06/11/2008:

> [...] It's been a while since I've
> daily-driven an FB (though I will again), but I seem to recall
> averaging 18 MPG in mixed driving. I think I still have the logs on my
> bookshelf. I'll look this evening.

HA! I forgot I still have them on my Palm Pilot! (Which many years  
later has morphed into a Treo 680, but the data is continuous since  
about 1996!)

During 1997-1999, a red 1985 GSL was my daily driver. My commute was  
about 10 miles on a faster four-lane surface street (York road) with a  
few stop lights and traffic. So it's probably fair to call it
"mixed"  
driving. The car had 195,000 miles and the original engine when I got  
it. The catalytic converters were /horribly/ plugged. It wouldn't go  
over 50 MPH. I cleaned them out (leaving the main cat alone as it was  
fine). I never did any service more serious than spark plugs. I  
really, really liked that car and always drove it like I stole it  
until an idiot rammed me at 35 MPH and destroyed it.

Tossed the numbers into OpenOffice.org spreadsheet and pulled out an  
average of 18 MPG over those three years, 70 tanks, and 20,000 miles!   
(Standard deviation is only a significantly small 2.14 MPG for you  
data geeks. ;)

So, yes, I think something is wrong if you are only getting 12 MPG. :(

  - Bill
    SRX7 #77 & #79               Go Racing NOW!
    Forest Hill, MD            http://SpecRX7.com/




------------------------------

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