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trying to find the cause of my relatively crappy mileage, '91tc i've had 6 months. i had been getting 16-17mpg city; best i've ever got was 24-25 mpg highway. i figure i should be at least 28-30 highway. changed plugs/rotor/o2 sensor/air filters. set timing to 19' with modified retard. last fill up was 21 mpg in mixed driving. plugs look clean (old ones also). could plug wires be a source of poor mileage? any other suggestions?
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