Re: [Amc-list] Mobilgas Economy Runs

[Wrambler242@xxxxxxxxxxx]

I realized yesterday after doing a run that we know the exact mileage of the trip that my fancy autometer speedo is a little off.
   I'd checked it last year and it seemed to read about 2-3 mph fast compared to roadside radar units they set up in construction zones.
   now  Sunday I made a direct run on a trip we have checked over and over again in every vehicle over the years and it always comes out to 52 miles. Well, the odometer in the American reported 48! So the speedo needle runs high and the odometer runs low!  B.S....   Anyway computing the difference my previous tank moves up to a little better than 23 mpg. Not bad for a soon to be 40 year old brick running 75mph and being driven pretty hard on the back roads at times...
   I'm going to be contacting Autometer about having it recalibrated this winter.
It's only showing 600 miles on the odometer, should be a little better matched speedo to odometer if you ask me.

   

--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5
2004 Grand Cherokee Laredo, 4.7L, Quadratrc II
" Chronic Pain Hurts"

 -------------- Original message ----------------------
From: Ken Ames <ameskg@xxxxxxxxx>
> My 74 Gremlin gets 30 mpg (25 US) cruising at 65 mph. There's a 1400 mile trip
> I've done probably 20 times over the years and that's the number I get.
> 232 T-14 2.73:1
> I use a vacuum gauge also and have since about 1975. Usual reading on the
> highway is about 10" vacuum. My Nissan usually has lower vacuum, around 7", but
> gets way better mileage due to the smaller engine. It needs more throttle
> opening so is running more near peak volumetric efficiency. Peak MPG would be
> with an engine small enough or geared slow enough that it would take full
> throttle to maintain speed - most near 100% VE.
> IMHO
> 
> Ken 
> 
> 
> Quoting Jeff Reeves <amcnut@xxxxxxxxxxxxx>:
> 
> > I believe those runs were done at low speeds (@30-35 MPH) under controlled
> > conditions. I think that Tom's surmise of thin lubricants can be a safe one,
> > and I'm sure the tires were probably inflated rock-hard. The cars were the
> > basest models available. I've also seen some documentation that the drivers
> > of the cars used in the Mobilgas run were barefoot while doing the test. By
> > driving barefoot, the driver can better moderate his touch on the accelerator
> > and brake because of improved sensory input. 
> > And no, contrary to some urban myths, it is NOT illegal to drive barefoot
> > anywhere in the USA--the only known exception being that Alabama
> > motorcyclists have to wear some kind of shoe. (And, to address a pet
> > peeve--no US states have *any* laws, health department or otherwise, stating
> > that bare feet in general are illegal: all those "by order of the health
> > department" signs are pure BS)
> > 
> > I personally drive barefoot more than shod mostly because it's a personal
> > preference. I find that I can "feather" the gas pedal in a way that prevents
> > abrupt throttle movements. It also helps prevent overtaxing the brakes. 
> > 
> > I also installed an old-fashioned vacuum/economy gauge on my Jeep that has
> > helped temper my driving habits. It's surprising that tootling along in
> > overdrive isn't always a bright idea. I find that at low speeds on back roads
> > the vacuum gauge jumps higher when I lock out overdrive and get the RPMs up
> > to about 1800 or so on my Jeep.
> > 
> > Jeff Reeves
> > Auburn, GA
> > 94 Cherokee Sport
> > 81 Spirit GT
> > 72 Javelin SST
> > 
> > 
> > Message: 10
> > Date: Sun, 25 May 2008 21:13:41 -0400
> > From: "Bruce Griffis" <bruce.griffis@xxxxxxxxx>
> > Subject: Re: [Amc-list] 17.339 MPG around town
> > To: "AMC/Rambler owners, drivers and fans." <amc-list@xxxxxxxxxxxx>
> > Message-ID:
> > <a72582d20805251813p71ea02d3i35ad7703a886f0c6@xxxxxxxxxxxxxx>
> > Content-Type: text/plain; charset=UTF-8
> > 
> > I'd love to learn more about how they did those Mobil runs! I'm sure
> > there are a lot of tricks out there. Time to start researching.
> > 
> > On Sun, May 25, 2008 at 8:26 PM, Tom Jennings <tomj@xxxxxxx> wrote:
> > 
> > >
> > > I wonder what cheats they pulled to get 30 mpg from those Mobil
> > > Economy Runs! I assume thin oils everywhere, good for contesting
> > > but not so good for longevity!
> > >
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