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My average on a healthy 96 ka 5 speed mixed is 8.6l/100km which equates to 27.35 mpg. Thats 60/40 highway/city with me driving it normal with some WOT runs. All I had at the time of those recordings was a 3" catback. Everything else 100% stock 87 octane. Double check your timing and look for exhaust leaks.
CTS as others said will cause the car to run rich if it cant read temps. Make sure your air filter is clean, fuel filter is clean etc.
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