I to have tuned up our car, always checked the tires and air filter. Burn synthetic oil and gone from 31 to 21 miles per gallon.
Feb 23, 2019 at 1:57 PM
Loss of gas milage
2014 HONDA CIVIC
PHOTOMAN407
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Hello,
This could be a spark plug gap problem. If the spark plugs didn't get properly gapped this could account for poor mileage. Is your Malfunction Indicator Lamp(MIL) a.k.a. "check engine" light illuminated? I have included a troubleshooting guide for in the diagrams below. Get back to us with what you find out.
Thanks,
Alex
2CarPros
This could be a spark plug gap problem. If the spark plugs didn't get properly gapped this could account for poor mileage. Is your Malfunction Indicator Lamp(MIL) a.k.a. "check engine" light illuminated? I have included a troubleshooting guide for in the diagrams below. Get back to us with what you find out.
Thanks,
Alex
2CarPros
Images (Click to enlarge)
Feb 23, 2019 at 6:09 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.