Thinking ahead here to when my MsNs is installed and everything is running smoothly, I was hoping I'd be able to do a simple adjustment via laptop and re-tune the car for fuel economy instead of power. I read that all you would have to do to accomplish this is adjust the AFR? I read 12-14 is good for high power but 15-17 for great fuel economy?

My question is this: Is it true that you can make a simple switch via the laptop hooked up to the MsNs to go from high power to high fuel economy? If so, what kind of fuel economy could you expect @ 15-17 AFR? I know this is TOTALLY dependent n how good/bad of mileage the car was getting BEFORE such change was made so let's assume it was getting 18/22mpg with good power; would like 22/28mpg be likely by robbing the car of all that power and increasing the AFR or do I just have this whole idea comnpletely wrong? thanks for reading...

True, you can add a switch to the unit for map switching, but a properly tuned vehicle should already be configured for both maximum fuel efficiency and power. You control how much fuel is expended with the throttle pedal, not the tune. A map switching switch is better used for switching between two completely different configurations (i.e. C16 and pump gas).

Originally posted by VelocitaPaola
A map switching switch is better used for switching between two completely different configurations (i.e. C16 and pump gas).

I'm planning on using that for E85 and 91

I've considered doing this, but, I really don't see it paying off after all the time spent tuning and money for MS..