2006 Honda Civic mpg has decreased

2006 HONDA CIVIC
40,000 MILES • 4 CYL • FWD • AUTOMATIC
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RMEYER0
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city/highway mpg was 30+ and over time has decreased to 25 mpg . we use chevron gas and do the oil changes + filter and air filter.

there is a slight hesitation on the stop and start

situation like at a stop sign.

when should the valves be adjusted? there is no noise in the top end.
Aug 7, 2009 at 6:30 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.
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