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Sorry for posting so much later than when the thread was created but I recently acquired a 98 Honda Civic HX and I'm averaging about 42 mpg. I'm trying to get it up to 50 mpg. I've changed spark plugs, fuel filter, air filter, just the whole tuneup and I'm using 5w-20 oil. Do you have any suggestions for these cars? I have yet to find out when the car is in lean burn mode and when it's off. Thanks!
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