Lost 4 mpg why??? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 7 (permalink) Old 04-22-2011, 12:26 AM Thread Starter
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Lost 4 mpg why???

I have a '05 F350 sc dually I bought it in July of '09 with only 12,700 mi. on it, at the time I was working in Indiana and driving around it got 14-15 mpg. and when I drove it home the lie-o-meter said 18.3 and when I did the math I came up with 18.4 so it was close and I was happy. Back in Ohio I did not drive as much on the highway and over time the log would read 12.5-13.5 and I thought that this was normal. I just went back to Indy and when I left the log read 13.6 so I thought that by the time I got to Indy it would be back up to 18 but the best it said was 14.1. So what do you think? it seems to run fine,the only things that have changed are that I have a tonneau cover on it and the turbo has been replaced by the dealer.
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post #2 of 7 (permalink) Old 04-22-2011, 12:41 AM
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Re: Lost 4 mpg why???

Check to see if your brakes are dragging. Fords seem particular vulnerable to that.

Reboot your ECM. Disconnect your batteries for a minute the reconnect.

2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Slammed 4"
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post #3 of 7 (permalink) Old 04-22-2011, 12:49 AM Thread Starter
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Re: Lost 4 mpg why???

I will check the brakes time to rotate anyway. Talking to a buddy it may be as simple as I was driving faster since they raised the speed limit on the Ohio turnpike to 70mph.
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post #4 of 7 (permalink) Old 04-22-2011, 12:53 AM
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Re: Lost 4 mpg why???

i going to say boost leak from the dealer doing the turbo swap.

2008 got a new flex pipe installed. S-b intake, 4in dp back exhaust, gear head tunes All deletes done now.
flow pro hot pipe. CCV mode.

2013 dodge charger
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post #5 of 7 (permalink) Old 04-22-2011, 02:20 AM Thread Starter
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Re: Lost 4 mpg why???

If I had a leak would it make some kind of sound? or would I get some kind of a warning light?
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post #6 of 7 (permalink) Old 04-23-2011, 02:30 AM
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Re: Lost 4 mpg why???

They probably reflashed you FICM to a newer update with out telling you. They reflash them for emmisions which cost you power and mileage.

2006 F-250 CC SB 4X4, all stock with egr system for now.
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post #7 of 7 (permalink) Old 04-27-2011, 07:29 PM
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Re: Lost 4 mpg why???

Common complaint after a dealer reflash...


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2006 F250 CCSB FX4 Lariat
GlowShift Tinted gauges, Recon Clear Cab Lights, Diamond Eye Duals, SRL Files, 2.5" rize leveling kit, F350 Rear Blocks, PHP Tuned FICM, Retro Solution 6K HID's, DieselSite Coolant Filter...


2011 Oxford White SuperCrew EcoBoost FX2
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