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My 02 Tacoma x-cab SE-5 4X2 2.4L autotrans is loosing gas mileage. I have 31,000 miles on her, drive combo city/highway and get around 17mpg. I was getting around 21mpg before I changed my spark plugs and fuel filter. I used OE plugs but a NAPA fuel filter (local toyota dealer was out). I know the plugs are gapped correctly and installed correctly, as is the install on the fuel filter. Could using an aftermarket fuel filter effect the gas mileage? I am baffled! Any help? One other thing, I use chevron regular gas. Thanks.
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