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Old 05-21-2013, 12:28 PM
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Crazy fuel mileage increases

My 2008 F250 is getting increasing fuel mileage but the jumps are just crazy. Now when I first purchased the truck at 140k miles it had bad thermostats. Dealer replaced them, but no telling how long they weren't working properly. This caused excessive cooling and occasionally a P0128 code to pop. Anyhow, I made them fix this before I drove it off the lot.

Initially, I was getting around 13.2 mpg on my first two tanks. I have been more cautious of my warm-ups, regens completing, etc. with my scangauge now. We went to Colorado this weekend and my mileage really jumped. Going up there and driving around Durango we got 16.0 mpg on the tank. Once we drove back, all highway 75 mph, I topped off when we got in town and filled it with a 1/2 of a tank, got 19.2 mpg average.

I couldn't believe it. I mean literally did not believe it. I went back out to the pump and tried to add more fuel since I always try to squeeze an extra gallon or so after initial pump shut off. Nothing more would fit in the tank.

Now my miles to empty indicator is giving me about 510 miles per tank and my lie-o-meter (I reset at my first tank after buying) is saying 17.9 mpg.

Anyone getting these numbers, specifically over 18-19 mpg? This is crazy. I wonder if the DPF had not regen'd properly due to the cooling issue and now it has finally cleaned out.

BTW, my regens occur right at 200-220 miles. Is this good/bad?

Thanks!!!
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Old 05-21-2013, 02:27 PM
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I'm guessing this is hand calculated? And the regens are normal. If this is true then that is awesome for a stock 6.4. When I was stock the best I saw running all highway was 14.5. Now tuned and deleted I can average 19-21 with cruise set at 68 mph. The lie o meter says 25.
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Old 05-21-2013, 07:06 PM
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Yes, this is hand calculated. The lie-o-meter shows generally 1-2 mpg more than actual. I was very surprised when these numbers showed up. Of course we did all highway there and a little city driving. The way back was all highway, but it's still awesome.

We bought the truck for hauling our toys and camping. I had a Ford Ranger since 1996 that had no power (4 cyl) and only got 20 mpg city/highway/uphill/downhill. I'm pretty stoked about my truck.
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Old 05-22-2013, 07:56 AM
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What's your axle gearing? 3.55?
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Old 05-22-2013, 08:12 AM
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Makes sense !

13 is normal around town (for me at least)

Going (up hill) to CO on the HWY. 16 would be able right

Coming back (down hill) 19.5 seems right as well.

What was the total elevation change?
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Old 05-22-2013, 08:12 AM
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3.73. Why do you ask?
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Old 05-22-2013, 08:21 AM
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Quote:
Originally Posted by CoolHandMatt View Post
Makes sense !

What was the total elevation change?
About 2000 feet from Albuquerque.

If you think this is normal, great! I expected 14 mpg no matter what. I have read that's what most people get. I'm also at 5000 ft above sea level so I expected a little power loss and decreased fuel mileage to compensate.

Awesome!
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Old 05-22-2013, 08:27 AM
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Just for info since I have seen a lot of post on fuel mileages that people are getting with their various engine mods/tire sizes posted, but rarely do I see anyone posting the axle gear ratio. Gear ratio can have an effect on fuel mileage when your cruising down the freeway @ xx M.P.H. Thanks for the info
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Old 05-22-2013, 08:45 AM
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I have read plenty of fuel mileage posts. Most seem to be getting good fuel mileage with a DPF delete. I have read a lot on frequent regens too. I think my truck is right in the good region on both.

Wife won't let me spend $2k to get a tuner, exhaust, and intake yet. She seems to think we need to save money for the future. Crazy woman!
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Old 05-22-2013, 08:50 AM
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Quote:
Originally Posted by Expirobo View Post
I have read plenty of fuel mileage posts. Most seem to be getting good fuel mileage with a DPF delete. I have read a lot on frequent regens too. I think my truck is right in the good region on both.

Wife won't let me spend $2k to get a tuner, exhaust, and intake yet. She seems to think we need to save money for the future. Crazy woman!
LOL

I know what you mean. I bought my tuner before the EPA bull and I just picked up a delete pipe, just havent had time to install yet. With the above purchases I earned myself a scowl and evil eye (and I think she was holding a baseball bat behind her back) from my beloved wife who thinks the same way as yours does.
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