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Does anyone have any experience with the EFFuel ECO OBD2 device that claims to increase your mileage? Sounds like a scam, but maybe it overrides settings? It's $40. I know nothing about what can be done via the OBD2 port, or whatever it is. Thanks, Mike Hartfie;d

2012 Ford Focus stick, 54k miles. I'm running Peak 5-20 Synthetic with 1 qt of 10-30 (not that it matters for this question?). When my mechanic changed the oil several changes ago, I had him NOT reset the Oil change interval just to see how far it would go: answer was about 9,500 miles in...