Quote:
Originally Posted by brucepick
Does this men your car used 1.55 gph at 2700 rpm, not moving, warmed up, with all accessories switched off? I think that's what you're saying.
If so, try this calculation. Turn the math around and divide gallons by miles. That will tell you how much fuel is being consumed per distance, JUST to keep the engine turning. That is, not considering any useful output from it.
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Yes, that is exactly what I did, netting a Terminal F/E of approx 45mpg at 70mph.
Quote:
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Originally Posted by RobertISaar
unrealistic of real-world driving conditions.
2700 RPM while not moving is a significantly different situation compared to 2700 RPM while accelerating in any gear, 2700 RPM while holding a speed in any gear and 2700 RPM while engine braking in any gear.
the load placed upon the engine is different in all of those situations.
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Yes, I understand all this, hence "Terminal."
My point in this thread is that by calculating your completely unloaded engine F/E at a given RPM, is that you CAN NOT exceed (nor by any chance meet) said MPG without the addition of other methods for extending fuel economy.
Was my original post really that hard to understand?