how come my MPG didnt change - Ford Powerstroke Diesel Forum
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Old 05-01-2009, 04:18 PM
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how come my MPG didnt change

I recently took off my 8" lift and 37's and put on a leveling kit with 33's and figured it would make way better mpg but it hasnt changed much at all. In fact its almost the same. The other day I got 14mpg and that was almost all highway driving, I got like 345 miles before the low fuel light turned on. I just checked it today after driving my 30 miles a day I drive to work and it averaged out to 13 mpg. On the highway trip I drove 65 and at the most 70 mph. And to work I drive no faster than 60 mph and only have to stop at two stop signs, theres no traffic where I live. I do let my truck Idle when I go into a store or do something quick like that, Do yall think my stage 2 injectors dump too much fuel at idle? Could it be my tuning? Thats the only thing I can think of. Im always easy on the pedal too. If anyone has any idea why my milage is so bad please let me know. Sorry for the long post. Thanks Garrett
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Old 05-01-2009, 04:32 PM
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Im still running a factory fuel system and no regulated return. Should I order the

PureFlow Technologies AirDog Air/Fuel Separation System FP150-F

and

some kind of regulated return kit

It does have a pretty rough idle.

What kits do yall recomend for a really good fuel system?
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Old 05-01-2009, 07:27 PM
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Did you have the chip tuned for the lift?
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Old 05-04-2009, 05:00 AM
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When I got the tuning done I did tell him I had 37" tires but he said they cant tune to change the speedometer so I dont think that should be the problem but I dont know. I just get back from a 335 mile trip this weekend and got 15mpg. Does this seem right to everyone? Seems low to me.
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Old 05-04-2009, 09:10 AM
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what size is your exhaust?
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Old 05-04-2009, 09:33 AM
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Its just the factory 3.5 inch exhaust with a straight and soon to be later today with a aero muffler. When i did all this to the truck jody told me dont bother getting a full 4 inch exhaust because the straigt gives 70 percent of what the 4 inch does. Do you think i need bigger exhaust? I dont have egt issues at all. I usually run around 600 to 750 going down the highway 70 mph.
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Old 05-04-2009, 11:42 AM
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Have you had your speedo recalibrated at any point? If not, that could be the reason. There are calculators online that can help you refigure your mileage based on gearing and tire size.
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Old 05-04-2009, 11:45 AM
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No I have never had it recalibrated but according to my GPS it is 1 mph off. So its pretty dang close.
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Old 05-04-2009, 11:52 AM
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Quote:
Originally Posted by rooney77 View Post
Have you had your speedo recalibrated at any point? If not, that could be the reason. There are calculators online that can help you refigure your mileage based on gearing and tire size.
His speedometer has nothing to do with the milage he gets bud....
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Old 05-04-2009, 11:59 AM
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Correct me if I'm wrong but don't the speedo/odo/trip-odo all work off of the same sensor? I know in my jeeps they do so if you don't recalibrate for tires then the odo shows an inaccurate reading of miles traveled which will throw off the mpg calculations. That's what my line of thought was. If it is different, sorry for the misinformation. I was just kinda thinking out loud.

Last edited by rooney77; 05-04-2009 at 12:03 PM.
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