poor fuel economy

2008 HONDA CIVIC
45,000 MILES • 4 CYL • FWD • MANUAL
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GBEMIADIO
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My 2008 Honda civic (i bought it brand new,) fuel economy is so bad... I try my best to take all precautions to ensure the fuel economy is improved (using tips after 'googling') but its not helping... I already change the plugs and fuel line components...what can i do next...Please advice...

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Feb 13, 2012 at 2:04 AM
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WRENCHTECH
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How many MPG do you get local and highway?
Feb 13, 2012 at 2:53 AM
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GBEMIADIO
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16mpg local and 19mpg highway
Feb 13, 2012 at 6:35 AM
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WRENCHTECH
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That's pretty far out of line. Is the check engine light ever coming on?
Do you have stock tires and wheels?
Feb 13, 2012 at 8:55 AM
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WRENCHTECH
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How about the exhaust system? Is that stock?
Feb 13, 2012 at 9:00 AM
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GBEMIADIO
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The tires are not stock neither is the exhaust stock...the engine light is not on ..i service it at 5000km interval consistently...
I have done all i know to do and i have not seen any improvement...
Feb 14, 2012 at 3:07 AM
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WRENCHTECH
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The aftermarket tires and exhaust are likely the cause. The tires will dramatically change the gear ratio and the exhaust will effect the backpressure.
Feb 14, 2012 at 3:24 AM
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GBEMIADIO
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Should i change the tires? if yes please recommend... what can i do about the exhaust?
Feb 14, 2012 at 3:55 AM
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WRENCHTECH
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The EPA fuel mileage estimates are assigned to the factory configuration of the vehicle. Aftermarket mods will always change that.
Feb 14, 2012 at 3:59 AM
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GBEMIADIO
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What kind of tires should i buy to replace the ones am using now?
Feb 14, 2012 at 4:05 AM
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WRENCHTECH
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Everything should be exactly as the car came from the factory if fuel mileage is your priority.
Feb 14, 2012 at 4:08 AM
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