Re: [Amc-list] Mobilgas Economy Runs

[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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