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Old 03-11-2008, 06:21 PM   #9 (permalink)
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Join Date: Dec 2007
Location: Southern California
Posts: 5,864

1999 Saturn SW2 - '99 Saturn SW2 Wagon
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90 day: 40.49 mpg (US)
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aerohead -

Originally Posted by aerohead View Post
I'm also in the "it depends" camp.I think every vehicle has a sweet spot.There's no question that loads increase with speed,however,how the powerplant reacts to increased load may be counterintuitive,as in my case with the Dodge D-100.It's mileage is better above 55mph,so in it's particular case,it's brake specific fuel consumption hits the "sweet spot" at 65mph,not true for any of my other vehicles.Experimentation may be the only means to discover peak efficiency for each vehicle.
I think we need a "BSFC Topo Map Collection" sticky. It would be a cool way to compare engine behavior. There could be little "X marks the gold" spots on it for MPG, .


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