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Discussion Starter · #1 ·
What is it that actually triggers the ECO light to turn ON ? Yes I know it means that I'm driving in an efficient economical manner. But here's the thing,...I've seen it light up at 75mph on long straight stretches. At other times, traffic or road conditions do not permit my transmission to shift up into the next higher gear, and yet ECO is on. Lifting my foot off the pedal will turn it on, but accelerating will keep it off until speed is reached. My little 3.7 doesn't deactivate like the hemi's. So if it's not tied to rpms, nor pedal pressure, and evidently not mpg either, what does it work with? Does my computer figure this out somehow ? (no I don't have a fancy EVIC display). It is however an effective tool and I can keep it lit most of the time. Worst mileage I've ever calculated was about 16 and best just a tad over 20.
 

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Discussion Starter · #3 ·
Vacuum sensor

Vacuum sensor + pedal + engine load + computer + , + , + but pretty much that vacuum sensor.

Thanks Asur,....so a bunch of factors involved. Never was exactly clear on the term "vacuum", but guessing it's the suction force or negative pressure created by the downward movement of the pistons with each revolution? Would make sense though about the ECO light. If that's the case, the more I'm on the pedal, the lower the vacuum?...and turning my light 'off' ?
 

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Thanks Asur,....so a bunch of factors involved. Never was exactly clear on the term "vacuum", but guessing it's the suction force or negative pressure created by the downward movement of the pistons with each revolution? Would make sense though about the ECO light. If that's the case, the more I'm on the pedal, the lower the vacuum?...and turning my light 'off' ?

If you ever get yourself a Bully Dog tuner, check out the driving coach, it works off all those factors but also gives you a visual and audio feedback of what your doing and how its affecting the consumption of the vehicle.:smileup:
 
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