My MPG effing sucks! - Ford Powerstroke Diesel Forum
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Old 01-13-2009, 09:30 AM
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My MPG effing sucks!

A few months ago I was getting somwhere between 16 and 18 mpg (mix hwy/city) and it has slowly crept down to 12-14 mpg (14 if I'm lucky!). I haven't changed my driving habits and nothing seems wrong with the engine. It isn't any colder than normal so it's not due to the weather I don't think. Maybe a bit more vibration than usually (little vibrations, it reminds me of a cell phone, not like the whole front end vibrating). We just got everything checked over and all the fluids changed etc. in November and he said everything looked fine. He said I should keep an eye on the injectors because the computer showed that one stuck open in the past sometime, but it wasn't something serious yet. Could my injectors be starting to go?!

Any suggestions? Thanks!
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Old 01-13-2009, 09:32 AM
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Are your hubs locked in? And might be a injector going bad. My mpg did the same thing and it was the #4 injector.
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Old 01-13-2009, 09:49 AM
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winter blend.... I have heard that the anti-gel winter mix fuel gets less mileage than the summer blend. I have noted radical differences in mpg from different tanks, especially when traveling thru Colorado (high altitude also) last winter. I now add a Cetene Boost additive for the winter months....
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Old 01-13-2009, 09:52 AM
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Have you checked to see if there are any DTC's?........Goose might have nailed it, sounds like you have an injector going down
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Old 01-13-2009, 10:27 AM
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He11, my normal combined average is always pretty much 13.4 on my 05 Harley with a 50/50 driving mix. On a long trip highway only I have managed 15.4 but that really is the exception not the norm.
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Old 01-13-2009, 10:32 AM
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if you had an injector going down, wouldnt you be able to feel it though during the course of normal driving??
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Old 01-13-2009, 10:34 AM
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Its most likely winter blend diesel this time of year
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Old 01-13-2009, 10:46 AM
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Well it might not be "abnormally cold" but at least down here is colder then it was a few months ago, and my MPG's are down too. I'm seeing slightly higher numbers then you are, but I think its probably slightly warmer too (it was -4F on my way to work this morning.

$0.02
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Old 01-13-2009, 11:05 AM
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I get 10mpg empty on the freeway so don't feel to bad.
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Old 01-13-2009, 11:06 AM
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Quote:
Originally Posted by 2005F250 View Post
I get 10mpg empty on the freeway so don't feel to bad.
I hate to say it but you've either got a brick tied to your right foot or some other issues
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