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Old 10-01-2018, 01:28 PM   #21 (permalink)
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Quote:
Originally Posted by Big Dave View Post
They do well in the EPA tests but real-world, they get about the same as the V-8s.

Secondly, I wouldn' hit a dog in the butt with a direct-injected gasoline engine. Intake valves coke up and cost a fortune to fix.

Direct injection is not ready for prime time.


My 2013 3.5 had~265k on it when I sold it, zero problems and the valves were clean. Ford builds hundreds of thousands of DI engines a year, very very few have problems with the valves and those problems are usually related to wrong oil or oil change interval. Most people either drive to far between changes, or use an oil with a high NOAK rating.

Also, a 300.0 catch can eliminates the problem, completely.

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Old 12-02-2018, 01:41 AM   #22 (permalink)
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I have a 2017 3.5TT super crew 4x4 with the 6.5’ bed. My lifetime hand calculated mpg is just north of 18.3 for 30k miles.

My best ever tank was 25 mpg for around 300 miles. It only happened once, but it was remarkable enough that I took a picture of it. It wasn’t by chance, I was hypermiling the heck out of it, it was summer, and I was driving around 60mph.

I have modified my trucks mpg readout to be more accurate, which was luck that Ford lets you do that by entering engineering mode. I had to make a 6% correction, as the truck was particularly optimistic about how efficient it really is.

The real reason I wanted to reply to this thread is that I can’t imagine 30mpg in a 3.5TT. I had a loaner 2.7TT that was a super cab 2wd. I was able to get just over 30 mpg by hypermiling it. However, I’m sure that trucks mpg readout was every bit as optimistic as mine was set from the factory...so I wouldn’t stand behind that number other than to say it got great mileage.
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Old 12-02-2018, 05:28 AM   #23 (permalink)
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Update on Fuel mileage on chevy full size 2.8 Diesel, up to 33 mpg

Well the engine and drivetrain are broken in now. I have been able to get over 30 MPG with light A/C, running about 7500 lbs, holding around 68mph in 8th gear and behind a semi for 60 miles. I got about 27 recently on a 60 mile trip.... I think the emission system was in clean up mode for the trip as I saw a sudden drop in mileage not too far into the initial leg. This drivetrain is a really good combo except the trans holding low gears too long. Reprogramming the trans will probably pick up about 10% in typical fuel economy.


Last edited by 93tracerwagon; 12-02-2018 at 07:02 AM..
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