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Clogged fuel filter or a leak in the fuel line. EFI fuel pump may be malfunctioning. Using a very poor grade of fuel can also affect performance and gas mileage. There are some brands of gasoline that I wouldn't put into my tank even if the gas was free of charge!

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Q: What could be some of the reasons for sudden poor gas mileage on a 88 Honda Accord with efi?
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