Last post on Aug 27, 2012 at 10:06 AM
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Ford F-250 Super Duty, Dodge Ram Pickup 2500, Chevrolet Silverado 3500, Diesel, Truck
#100 of 133 Re: 4x2 vs. 4x4 and F250 vs. F350 3.73 rear end [diehardford]
Apr 15, 2008 (5:03 pm)
Thanks alot for the info. May I ask again what year your your super duty diesel is? Also if you dont mind may I print your reply and use it in my arbitration case. I need to show Ford that my '08 is not functioning properly comparing to other '08's. Ford has since come back to me since starting the arbitration saying that my 5 check engine lights for low engine operating temperature warming problem is NOT a problem and my truck is run correctly. I do know that my 2005 6.0 diesel would warm up just as you explained your is warming up, and my '08 is just the opposite.
#101 of 133 Re: 4x2 vs. 4x4 and F250 vs. F350 3.73 rear end [firewalkerjohn]
Apr 18, 2008 (7:34 pm)
Hi John, My truck is a 2008 with the 6.4 diesel. Yesterday I took it to the dealer for a oil and fuel filter change. I spoke to the mechanic about letting the truck warm on cold mornings . His opinion was that its not a bad idea to let one warm up for a few minutes before driving off. He is one of two mechanics certified to work on the new 6.4 at this dealership. I don't mind you using my reply in your case. Do remember that the 6.4 has a total of 6 different radiators to keep things cool. The main radiator is about 20 percent larger than the one in the 06. So the 08 is naturally going to take longer to warm than the 06, but it should still warm up some. I will agree with some of the other post that a block heater in colder climates may not be a bad idea. They are not to hard to install and some will install in the radiator hose line. Several years back those were about 80 dollars, I have not priced one lately. Hope this helps Frank
#102 of 133 Re: 4x2 vs. 4x4 and F250 vs. F350 3.73 rear end [jim314]
Apr 18, 2008 (10:32 pm)
Ford does offer an auixilary cab heater and engine block heaters on their 08 trucks.Neither option was that much, I believe the cab heater was around 200 dollars and the engine block heater was around a 100 dollars. If I had done a factory order I would have got both options. however the main option I wanted was the in dash nav system and their were only 5 trucks within 200 miles of me with the nav and the color that I wanted and none of those had the cab heater or block heater. While I agree that letting a truck idle for 30 minutes to an hour is excessive I consider a five minute warm up in cold weather to be a normal warm up time. To not let it warm up enough to clear the windows is both illeagle and unsafe. While I haven't had experience working on truck diesels I have had experience working on standby diesel generators every thing from a 5 hp pull cord up to a 16 cylinder 8 turbo 10 thousand horse power unit with a 17 inch bore and 21 inch stroke that sips fuel at about 43 gallons per minute. Each of these were set to run at idle for 3 minutes to come to operating speed and temp before engaging load and after running under load each was set to run at least 10 minutes no load to cool down before shutting down. Ford recommends at least a 3 minute cool down on the 6.4 to cool the turbos after running under load. All of these engines would be 15 to 30 years old today so I can't say what a modern cummings engine would do but the ones i used to work on would generate heat and a lot of it at idle.
May 23, 2008 (11:14 am)
My '07 GMC Duramax w/ 15k miles gets a dismal 13.7 mpg max. It doesn't seem to matter if I am driving in town or on the highway. If I'm towing, it goes down to 11 mpg. That doesn't concern me as much as the absolutely awful gas mileage on average. My [now probably in Mexico because it was stolen] '03 F-250 got 18 mpg in town/22 hwy, so this was a bit of a shock. I waited not-so-patiently for the engine to get a few thousand miles on it, thinking the mpg would improve, but it hasn't. With diesel prices at this hour $4.59/gal. here in the SW part of NM, I would like any input on chips that might improve gas mileage. I'm not interested in more HP or torque. Am I dreaming?
#104 of 133 Re: 4x2 vs. 4x4 and F250 vs. F350 3.73 rear end [firewalkerjohn]
Jun 16, 2008 (3:35 pm)
I have the Ford 2008 F250 Lariat Crew Cab 4X4 short bed with the 6.4 Diesel. I've owned it for about 3 months and have 7500 miles on it. The new diesel engine/exhaust is programmed by the factory to go into a "soot burn-off" mode whenever the exhaust soot collector starts loading up. On my truck, I've noticed the burn-off happens about every 300 miles. During the burn-off period (usually about 15 miles of hiway driving) the MPG will drop down to about 12mpg. After the burn off period is complete, the MPG pops right back up to its normal value. For my F250, that's about 18mpg on the hwy at 65mph.
My Ford dealership was unable to explain the 12mpg when I asked them about it, so I had to do some investigation to figure out what was going on.
As for the fuel mileage trend while the engine is breaking in, I've kept pretty good numbers on my mileage, and 90% of my miles are commuting between Arlington and Seattle - a 100 mile round trip at freeway speeds. When new, my truck got about 14mpg. Now, with 7500 miles, I'm getting about 18mpg. This drops to about 15mpg when I'm tooling around town. I expect that mileage will continue to improve another MPG or two as the engine breaks in...
As a comparison, I traded in a gas 5.4 Triton 2005 F-150 that was getting about 16.5mpg doing the same type of driving. Doing the math, it costs me 27cents/mile to drive my diesel F-250. It cost me 25.5 cents/mile to drive my gas F-150.
Am I happy with my diesel performance? Yep! Still trying to justify a chip. If I could find one that has proven increase in MPG without playing with the fuel injectors, I would be interested. I'm pretty sure that the only way to improve gas mileage is to tighten up the shift pattern.
#105 of 133 Why use Fuel?When you can run your car with water
Jun 23, 2008 (10:30 pm)
Hey..people..have you ever heard of running a car on water.?
This is true,Why should we bother thinking about how to increase the mileage of the car using diesel.Even if we can increase the mileage its is still costly for us ,As the prices of crude oil are increasing day by day.So we should think of making a few alterations to the engine.We can run the car by the electrolysis of water producing Hydroxy gas.This is what called as HHO fuel.Lets think of it once.I have also seen some useful information in the site http://waterfuelkit.net.
I have given this idea because I have seen some of the people in the above posts saying that Its costing them a lot at a very low mileage and even the mechanics are charging a large amount of money.
I'm expecting a great milage at low cost using the HHO fuel
I hope you get what am saying.
#106 of 133 Re: How to get better fuel economy w/your diesel [trendom]
Jun 24, 2008 (4:10 pm)
I just joined this website after first researching hybrid cars etc. then fuel cell vehicles, and came across a site that said water could be used for fuel. My husband and I have a 2006 350 Ford Super Duty outfitted "to pull a house" bought with the intention of pulling a really big fifth wheel now used to pull a horse trailer and bought when diesel was "cheaper" than gas. Our other vehicle is a 2002 little Ford T-Bird and that is not fuel efficient. Our truck gets 14.9 miles per diesel gallon even not pulling. Any thoughts on this??????????????
#107 of 133 Re: How to get better fuel economy w/your diesel [ladykathleen]
Jun 24, 2008 (4:40 pm)
The water fuel claims are bogus, and the sites that promote it are a scam. Water contains no net fuel value. It requires more energy to electrolyze water to split it into hydrogen and oxygen than you could gain in hp when the hydrogen is fed into the hydrocarbon fuel stream.
#108 of 133 Re: How to get better fuel economy w/your diesel [jim314]
Jun 24, 2008 (6:10 pm)
You have of course converted a diesel or other vehicle to using water??????????????? The conversion "kits" seem plasible. They are inexpensive so who out there has actually done the conversion and what are the results????????????????
#109 of 133 Re: How to get better fuel economy w/your diesel [ladykathleen]
Jun 24, 2008 (11:16 pm)
In my opinium injecting water into a diesel is a big mistake and the repairs could be very expensive. A good web site to go to would be www.unitednuclear.com, then to their research and development site then hydrogen fuel info. These guys have been working on a hydrogen fuel conversion kit and hydrogen generator for quite some time. per them diesel will not run on hydrogen.