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...I had a 1984 Civic 1.6L DX manual and it got consistent 42 mpg.
...but, at one time the milage slowly rose to 54 mpg! but, was right on the verge of overheating too. Took it to Honda dealership, and the sage diagnosis was "clogged radiator." ...and it was true!
...about 1/3 of radiator had white gooey calcium deposits, after the radiator was cored and cleaned, the mpg returned to 42-ish mpg.
...the CVCC "loves" to run hot...very HOT! But getting too hot can hasten cylinder wear.
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