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Sadly I have no real A to speak of or I would try to quantify the change myself. I know my car should pick up a substantial amount of FE because without the thermostat the engine would not warm up sufficiently for the ECU to go into closed loop operation. Thus, no O2 sensor data and a constant limp home mode. I am hoping to see another 5 mpg when the car goes back into service next week ( $250 cars tend to need a bit of help to become reliable!)
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No green technology will ever make a substantive environmental impact until it is economically viable for most people to use it. This must be from a reduction in net cost of the new technology, not an increase in the cost of the old technology through taxation
(Note: the car sees 100% city driving and is EPA rated at 37 mpg city)
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