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Old 02-25-2016, 08:16 PM   #1
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Interesting F350 fuel mileage data

I had some business about an hour from home yesterday (58 miles one way). So I took the Ford F-350 and once I cleared town, I set the cruise at 47 mph for about 20 miles. I was on a secondary 2 lane country road, flat ground with really light traffic. Fuel mileage on the lie-o-meter started dropping and settled out at 14.7 mpg. I've noticed this phenomenon before, and just blamed it on the hills where I was at the time. I then bumped the speed up to 60 mph, reset the cruise, and fuel mileage began to creep up peaking at 22.1 mpg. Weird...

Obviously I'm a little dismayed at the crappy low speed mileage, especially since I'm hard pressed to explain it. Very happy with the high speed,...except that I have to question the accuracy of the display.

Thoughts?
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Old 02-25-2016, 08:26 PM   #2
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probably was going through a regen cycle. It drops to about that for about that long
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Old 02-25-2016, 08:46 PM   #3
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F350 on trip across state not pulling last weekend.
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Old 02-25-2016, 08:47 PM   #4
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Mine is similar. It really likes somewhere around 60.

At 47 mph, was it still in sixth or did it drop back to fifth?
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Old 02-26-2016, 01:16 PM   #5
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My F250 has shown similar behavior. The sweet spot appears to be between 62 - 67 mph. Anything above or below these speeds, the mileage suffers right away.
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Old 02-26-2016, 01:32 PM   #6
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I'll second the regen cycle...

I see the exact same behaviour and comparable mileage numbers, when mine's running a regen.

If you don't notice the quick pop-up, saying that a regen is running, there's no other indication on the dash/screen, other than the drop in mileage.
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Old 02-26-2016, 01:37 PM   #7
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I have gotten similar results with my 2015 Duramax. Best mileage has been 23.8 mpg at about 65 mph.
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Old 02-27-2016, 09:43 PM   #8
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KFX, it was definitely in 6th. Yep, being in regen cycle is the only logical explanation. I'll have to repeat the rest.

Thanks all

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Old 02-28-2016, 07:22 AM   #9
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Watch your RPM's that is a better indication of where your engine's sweet spot is than MPH. I haven't had to deal with the regen stuff... I have a 7.3 It does it's best mileage at about 1850 RPM, which with the current gearing is around 58 mph. As a general rule I try to stay under 2,000 RPM with that motor.

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Old 02-28-2016, 07:39 AM   #10
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When empty, my 2015 Chevy 3500 6.0 with 4.10 gets its best fuel mileage at around 60-63mph, which, on flat roads is right at 19mpg. When that speed drops or increases on the same roads, the fuel mileage suffers. I'd say what you experienced is normal. My "testing ground" is I-295, The Baltimore/Washington Parkway from DC to Baltimore, very early in the morning.

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