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818 Posts
Is there an ECM learning / whatever type reset that can impact this?
When my SO's subbie was new it would start to lose mpg after a few tanks... I would run a tank of 93 and it would hop back up. Did this about 10x over the course of 20k miles, now don't need to do it anymore. I have no explanation as to why this happened, and the car never felt different performance-wise.
When my SO's subbie was new it would start to lose mpg after a few tanks... I would run a tank of 93 and it would hop back up. Did this about 10x over the course of 20k miles, now don't need to do it anymore. I have no explanation as to why this happened, and the car never felt different performance-wise.
