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Old 10-25-2012, 02:31 PM   #607
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Join Date: Aug 2010
Location: Bay Area
Posts: 4,368
My Ride: X5, CT200h, CLK63 BS
Originally Posted by FragNasty View Post
Cruising on the freeway should utilize less than 10% of the available power. As long as the EGT is acceptable, the leaner conditions just means your car is getting more MPG with the new tune.

On the other hand, if the EGT is high, a couple MPGs more is not worth the risk of damaging the engine.

Perhaps it's worth putting in an EGT sensor? What AF reading do you get when it goes lean like this?

Last edited by MarcusLSB; 10-25-2012 at 02:31 PM.
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