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Old 09-26-2016, 08:57 PM   #71
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Gee Mr. H. Bean, your Super Duty driving experiences are very similar to mine. The diesels don't have the throttle response of a gas engine, but when the turbo builds boost, away we go. Your fuel usage is also very similar to mine.

I do use my Super Duty as a daily driver in the winter. It is a big, lumbering truck. Like you, I must watch my speed as I often find myself going faster than my senses think we are. It is difficult to maneuver in tight parking spaces. I need a place where other cars don't care to park, like a mile from the store entrance. But I don't mind.

And like you, I find my fuel usage varies dependent on conditions. I have observed:

Zero miles per gallon at idle. Many diesel owners like to idle their engines before leaving in the morning, or while running a short errand in the store.

5 mpg towing up a 7% grade at 50 mph. I never seem to gain all this back on the downhill side.

Headwinds cut my fuel usage by 10 to 15 percent. If I drive east I have a headwind, if I drive south I have a headwind. I seem to buck a headwind no matter which way I'm going.

I get much better mileage going downhill.

Winter blend fuel cuts my mileage about 5%. Cleaning the particulate exhaust filter cuts my mileage about 15% for the 20 minutes it happens.

Overall, I average 13 plus or minus 1 when towing. My gas V-10 got 10 +/- 1 while towing.

The advantages of the diesel pickup outweigh the disadvantages using the truck as a daily driver in my view.

David
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Old 09-27-2016, 09:24 AM   #72
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Ford programmed the takeoff power to be light as they were having transmission failures (a few years back)


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Old 09-28-2016, 05:31 PM   #73
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Winter blend fuel doesn't cut fuel mileage. It's energetic content is 4% less than regular. The problem is in coolant temps: failure to use block heater and/or winter cover.

A factory spec heat exchanger cover (winter front) is used when temps are 40F or lower. Never higher. Adjustable flaps means one can tailor the amount of air passing thru according to load.

Engine block heater use brings coolant temp up substantially. Means oil also starts to warm faster. Diesels won't warm up from cold when idled. Not without external help. Best to put it in gear immediately and ease down the road at a lower than normal speed.

Even in summer under a heavy load it will take more than 45-minutes at highway speed to bring transmission, engine and axle oils to op temp. Winter just that much worse. This is in Class 8, not just in these little boy toys.

Diesel engine cooling systems are oversized. No Airstream is going to tax one. Cylinder pressure is such that, otherwise, heat spikes must be contained. Too much fluid and heat exchanger surface.

Re-gens mean the engine isn't being worked. Short trips and light loads. Extended idling. Wrong engine spec for the job, in other words.

The "advantage" of diesel isn't in a one ton truck when it comes to pulling one of these travel trailers. A closer spec 20-years ago. Gasoline motor one tons and computer controlled multi speed automatics are a closer spec.
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Old 09-28-2016, 05:37 PM   #74
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Winter blend has always cut my mileage especially when towing.



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Old 09-28-2016, 05:58 PM   #75
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Quote:
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Winter blend has always cut my mileage especially when towing.



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It's coolant temp loss. Not fuel.
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Old 09-29-2016, 02:20 PM   #76
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Your mileage will increase when the engine gets broken in, which is between 15 and 24,000 miles. Towing in the mountains decreases the number of miles until break-in.
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Old 09-29-2016, 02:43 PM   #77
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Quote:
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Your mileage will increase when the engine gets broken in, which is between 15 and 24,000 miles. Towing in the mountains decreases the number of miles until break-in.

I have had 2 new 6.7 TD's and the mileage does not change from new after 39,000 which is when I trade.


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