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post #1 of 8 Old 03-02-2011, 07:22 PM Thread Starter
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Another MPG question (Sudden drop)

I have an 08 F250 4x4 with an SCT tuner and DPF delete. I had been getting decent mileage since installing the tuner and now the mileage has dropped significantly. (17mpg city 22-24mpg highway now dropped to 11mpg city 15 mpg hwy). The truck seems to be running fine, but I can't figure out what has caused the sudden drop. Any help would be appreciated.
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post #2 of 8 Old 03-02-2011, 07:28 PM
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Heavier right foot, winter fuel???? Just a guess or two.


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post #3 of 8 Old 03-02-2011, 07:33 PM Thread Starter
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I have watched my driving, and have been conservative driving around, with no improvement. As for winter fuel, I am not sure, I am in Tennessee, so I don't know if they are shipping winter fuel down here or not. Is it normal to see a big drop like this over the fuel? I have not heard any of my friends complain about their economy dropping this much.
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post #4 of 8 Old 03-02-2011, 07:33 PM
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stuck caliper, lots of idle time, low tire pressure, wheel bearing, bad tc, stuck injector, etc etc

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post #5 of 8 Old 03-02-2011, 07:34 PM
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did you check tire pressures?
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post #6 of 8 Old 03-02-2011, 07:42 PM Thread Starter
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Just put new brakes on yesterday and all seemed fine, just needed pads. I would think that if a turbo was bad I would notice a loss of performance. I have not checked the tire pressure, but will do that. It will stink if something that simple has slipped by me.
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post #7 of 8 Old 03-03-2011, 10:32 AM
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Sounds like it calibrated itself. Those numbers sound more like real mileages than the 17mpg city.

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post #8 of 8 Old 03-03-2011, 11:56 AM
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Quote:
Originally Posted by Barry Smith View Post
Sounds like it calibrated itself. Those numbers sound more like real mileages than the 17mpg city.
I agree. 22-24 MPG is a crazy number, and fairly unrealistic. 17-20 MPG maybe.
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