2010 f150 bad mpg

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Sep 4, 2023 | 01:58 PM

LbLb1293LbLb

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Joined: Sep 2023

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2010 f150 bad mpg

2010 f150 5.4 Harley Davidson edition. New long block, coils, plugs etc.
Replaced both upstream oxy sensors that had thrown codes.
Getting 10.2 avg. mpg.
Any suggestions?
Is fuel filter in fuel tank?

Sep 4, 2023 | 02:59 PM

glc

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Joined: Dec 2006

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From: Joplin MO

Quote:

Is fuel filter in fuel tank?

Yes.

How are you calculating gas mileage? Use a GPS to check your speedometer calibration, you can use highway mileposts to calibrate your odometer.

Sep 6, 2023 | 01:09 PM

butchdee

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When new motor had less than 500 miles. Drove to Ft. Smith and back 240 miles round trip. Plus a few miles took 26 gal gas. Was filled prior to going.
I was getting 12 on old motor with two bad upstream sensors.

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