Fuel, Oil, Cleaners & Other MaintenanceExtending the life of your Civic requires the proper fuel, oil, and cleaners, along with other regularly scheduled maintenance.
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I drive in central NM. My gas mileage as suddenly decreased from between 34 - 36 down to about 29 - 30 mpg. Two weeks ago I was driving in AZ and over to CA and my gas mileage was averaging between 36 - 39 mpg. My power is the same and nothing has changed. I go to the same gas station every time I fill up.