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Based on previous threads I'm not sure I will get an answer other than change driving habits but I will give it a shot. I'm consistently getting 15 mpg and there must be a mechanical or computer related issue. You don't drop from a normal 26 mpg average city driving to 15 because of poor driving habits, which I do not have anyway. The car runs fine but the fuel economy is poor, any ideas? I check every tank and normally get about 150 miles on 10 gallons. I've had 6 Hondas and I have never seen anything like this. 1.8L engine.

 
Rep Power: 367

O2 sensor going bad? Air filters?

 
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check engine light on??

Same drive as when you was getting 26 mpg??

weather conditions same??

 
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Check engine light is not on and the car runs good that's why I'm clueless. Same drive and weather. I thought maybe fuel leaking but I never smell gas.

 
Rep Power: 518

Did it drop right around the first week of November?

 
Rep Power: 142

I like the O2 sensor possible cause, also consider plugs and plug wires if your car has over 100K miles. Bad plug wires can really make a car run bad. Do a code read.

 
Rep Power: 308

No plug wires. Coil on plug.

 
Rep Power: 142

Thanks for the term correction, using old school terms.