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Keep in mind, you were also bringing the operating temperature closer to what the TBI system was designed around (probably 180* or 195*) and expects to be working with. It probably doesn't do much adjusting for colder temps, other than cold start enrichment.
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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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