Loss of gas milage

2014 HONDA CIVIC
58,000 MILES • 1.8L • 4 CYL • 2WD • AUTOMATIC
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PHOTOMAN407
  • MEMBER
  • 1 POST
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
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SCGRANTURISMO
  • CERTIFIED EXPERT
  • 4,897 POSTS
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
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Feb 23, 2019 at 6:09 PM