You'll only get a CEL for it if it hits the +/- 30% fuel adjustment limit that most OBDII setups have. The CEL isn't for the fact that it's adding fuel, it's for the fact that it hit the limit and can't add enough.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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