Re: Gas milage vs rear end ratio

[Dave Casey <dcasey@xxxxxxxxxxxxx>]

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Sweet spot indeed. If you mix the right cam, intake, carb, timing,
transmission, gear, and tires you can get pretty decent mileage. Putting a
lower gear will actually improve mileage in the city but hurt you on the
highway, with the exception of when a lower gear puts you in the "sweet
spot" on the highway.
The "sweet spot" is where your cam, intake, etc are making the most power
with the gas they're burning. If you keep your RPM in that range by
adjusting gears and shift points, you'll get the best mileage possible. Or
you could run 4.56's and leave clouds of smoke in your wake. Both are just
as fun.

Dave Casey

----- Original Message ----- 
From: <threecarb65@xxxxxxx>
To: "mopar" <1962to1965mopars@xxxxxxxxxx>
Sent: Friday, May 07, 2004 8:28 AM
Subject: Gas milage vs rear end ratio


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My personal experience went like this... I replaced the std 7 1/4 2.94? in a
/6 Duster with a 3.23 8 3/4 and GAINED mpg! The Duster had a mild Crane cam
and shaved head with porting.My theory is that the rpm increase at road
speed put the engine in the "sweet spot"Granted, this was a low HP
engine,but it was more fun to drive,and got more mpg.This may not hold true
with an engine that already has a good power to weight ratio,the experts
will know.Remember all the gadgets and trinkets in the old J.C. Whitney
catalogs??? If you installed all of them and added up the % gains, your car
would actually PRODUCE gasoline by saving more than it used! It is a fine
line to find the ratio that will work the best for mpg,keeping the engine at
it's "sweet spot" Too high of ratio will require more throttle to keep
enough torque to maintain the desired speed,thus,more fuel consumption.Long
flat road hill in the distance?Slowly get your speed up,ease up on the
throttle as you start to lose speed. Stan "El Cheapo" Clinton

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