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I have owned my 1997 Civic HX for over a year now. I get 39 MPG overall in this car and it is still 100% all original and stock. I drive to work 70-75 mph also. I use the stock NGK V-Power spark plug that is recommended in the Honda owners manual in this car. I talked to a guy who worked at Auto Zone who also owned a Civic HX. He said that him and another friend of his who also owned a HX tried many different spark plugs and the stock NGK plug got the best milage. The worst spark plug they tried dropped the milage down 5 mpg.
I also use Pennzoil Ultra Synthetic 5w-30 oil changed every 4K in this car. I keep the Mobile 1 extended performance oil filter on the engine for 8 K(two oil changes). I had the timing belt and water pump replaced recently at the Honda dealership. I have 192 K on the car now.
I need to buy one of those ScanGaugeE Fuel economy gauges for this car and try to get the best MPG out of it.
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