99 7.3 MPG DROPED ??? - Ford Powerstroke Diesel Forum
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Old 02-16-2009, 08:21 AM
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Exclamation 99 7.3 MPG DROPED ???

Hi ! i own a 99 f-250, i have been recording my fuel mileage since this summer and it as always been 16 to 17 Mpg and the previous owner was telling me he was doing some 21 Mpg ? and for my last couple tanks it as droped from 8 to 12 MPG it doesent start or run any different then before, it idles a bit more cause it is winter up here... did it happen to anybody ???

Thanks !
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Old 02-16-2009, 08:32 AM
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noticed a drop on both my vehicles 03-7.3, and 05-6.0, could it be the winter blend fuel?
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Old 02-16-2009, 08:34 AM
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WOW... that's quite a drop. I have lost about 2 mpg due to winter blend and/or longer idle time/warm ups, but yours is alot... maybe it's time for new filters, oil change, things like that might be it, but if you keep up on maint like that, I dunno... Air filter, fuel filter, oil change, might be a combo of all... hope some others will shed some light on this issue...
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Old 02-16-2009, 09:08 AM
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That's a big drop, winter blend is always good for 2 mpg drop, I would send a oil sample to Blackstone to see if there is any diesel fuel in there. Check your oil level as well as coolant for diesel contamination.
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Old 02-16-2009, 09:09 AM
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Ya i know 2 mpg is a normal drop but 8 ... not so much lol. i do my service every 7500 Kms wich include changing engine oil and all the filters, and is it really possible to get 21 to 25 mpg with a 99 powerstroke manual ???
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Old 02-16-2009, 09:43 AM
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Local fella I was talkin' to claims 21 MPG with his F250 man trans 3.73 gears... that's takein' it easy, I'd never get that! Like to hear the turbo sing too much! I pressed him for details, that's hand calculated, and highway miles, but none the less... 21 MPG.
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Old 02-16-2009, 09:37 PM
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Hehe thanks ! i am the same with the turbo singing hehe !
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Old 02-17-2009, 09:24 AM
dmd dmd is offline
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I got 20mpg ONCE... flat long road with a steady 60mph, and that just this one 50mile
section..

You can get good milage with a stick if you really baby it. 21mpg maybe doing 60
with no load, on the flats. Cant get that with overall city/hwy mix.
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Old 02-26-2009, 07:24 PM
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thats probably with stock tires to hehe !
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Old 02-27-2009, 05:04 AM
dmd dmd is offline
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Quote:
Originally Posted by builtnotbought View Post
thats probably with stock tires to hehe !


Yep... That is all I run. Need to get the best milage I can from it. Looks
all stock from the outside.
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