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Fuel Economy

 
  #46  
Old 08-24-2017, 04:02 PM
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Rusch,

Airtab | Aerodynamic Fuel Savers | Application

Some good testimonials on this site. I have these on my 39 foot 13'6" tall 5er, and had them on an earlier one that was a bit less tall. These absolutely keep the bulk of junk off the rear of the trailer, and absolutely take away any sway, even in cross winds. In theory, they should help mpg. On my first 5er, I was convinced they helped, but there are so many variables. I have only 31k miles on this 5er in 8 years, and the tall rig needs more tabs, plus on top of a.c. units, so I probably have not broken even in fuel now that it is now almost half the cost it was 9 years ago. They are not too expensive and are easy to apply. With you putting on that many miles at those speeds they may be a lot more than a good idea. They come in white and black.

Originally Posted by ruschejj View Post
Maybe you can help me. I've always had a work trailer in tow, it's 9' tall and weighs a lot (10-12k). I drive over 1,000 miles/week on average mostly 72mph.

I understand that directly behind my trailer is a huge low pressure area that creates tremendous drag. My thought is, to re direct air from the high pressure side (front) and turn it loose in the low pressure area, using some sort of duct work or spoilers around the tail of the trailer.

Would this help? Why hasn't anyone tried this? Am I just dumb? I'm not looking for 5mpg gains, just 1 or 2 would impact my cost per mile hugely.
 
  #47  
Old 08-27-2017, 10:16 PM
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2016 F-450 with 4.30 rear end pulling a trailer - total weight 23,250 - from Tennessee to Georgia yesterday was 12.1 mpg. It's deleted with 4" resonator and muffler. Driving around middle TN hills empty got me 14.1 - 14.5 mpg over two weeks. The truck has 24,000-ish miles on it.

FYI - best economy I ever saw was a short trip of 155 miles, empty, at an approx average speed of 50 mph. I got nearly 16 mpg.
 
  #48  
Old 09-02-2017, 11:07 AM
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This is my mileage log for the trip...under the line. The 3rd set of numbers had some city driving in it as reflected by the 15ish MPG. The last set of numbers has city driving in it also as I didn't fill up right away when I got home. I took the average of all and got 17.224 mpg. Taking I90 west bound is mildly hilly in Western NY as is PA for as brief as you're in Pennsylvania but Ohio flattens out. Then gets hilly again before Kentucky...so with speeds averaging between 70 and 78 mph, I'm very happy with my best mileage of 18.46 mpg. I can't imagine if I slowed it down and did the speed limit...but I can't drive 55...

Without the EPA mandated "rocket" on the exhaust, it would probably shoot up by at least 2 miles per gallon.
 
  #49  
Old 09-02-2017, 11:22 AM
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My truck is a 15 f350 with the 3.55 rear end. Fully deleted with 5"exhaust. Just completed a 2300km round trip. Cruise set at 110km/hr. Hand calculated at 20.6mpg or 11.4l/100km. Last oil change of city driving and short hwy trips to the plant I work at I averaged 14.2l/100km or 16.5mpg. Biggest gain I have found from the weight loss is when i'm off work for a couple weeks and just putting around the city, truck seemed like it used to fill up that stupid filter every 3 or 4 days and regen forever putting around, then I would go for a drive on the hwy and waste some more fuel and time. Hated that pos filter, will never own another diesel with it. Not to mention my oil actually stays golden brown for quite a while after a change now.
​​​
 
  #50  
Old 09-02-2017, 11:35 AM
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Originally Posted by Overkill2 View Post
but I can't drive 55...
Hey, wait a minute....aren't you the PoPo!? Lol
 
  #51  
Old 09-04-2017, 01:36 PM
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Originally Posted by cappa View Post
My truck is a 15 f350 with the 3.55 rear end. Fully deleted with 5"exhaust. Just completed a 2300km round trip. Cruise set at 110km/hr. Hand calculated at 20.6mpg or 11.4l/100km. Last oil change of city driving and short hwy trips to the plant I work at I averaged 14.2l/100km or 16.5mpg. Biggest gain I have found from the weight loss is when i'm off work for a couple weeks and just putting around the city, truck seemed like it used to fill up that stupid filter every 3 or 4 days and regen forever putting around, then I would go for a drive on the hwy and waste some more fuel and time. Hated that pos filter, will never own another diesel with it. Not to mention my oil actually stays golden brown for quite a while after a change now.
​​​

Thanks for posting up...I figured the guys with deletes would do better than us stockers. I just figured out that 110 kph is just over 68 mph. I'm just wondering what you would get by going over 70 mph... Because my average speed was over 70 with cruise...between 72 and 78 mph...hmm...I wonder. Were there a lot of hills on that trip? How many miles does your oil stay clean looking before she turns black?

Originally Posted by elee3 View Post
Hey, wait a minute....aren't you the PoPo!? Lol

Why yes...yes I am. But I'd be lying if I said I drive the speed limit all the time. I'm older now so I have mellowed some, but highway driving is usually done at 10-12 mph over. Since I've been a Lieutenant now for about 2/3 of my career, I rarely write tickets. I was never a huge V&T guy. My old partner and I would use it to arrest crackheads back in the day on 4-12s... I've also never written a cell phone ticket because I use mine at times when I'm in my truck. I think there's an argument to made against that law...texting is worse than talking because you take your eyes off the road to text. Talking on your phone is the same as having a conversation with a passenger in the truck as you drive...
 
  #52  
Old 09-04-2017, 09:16 PM
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Well boyz n gurlz, I have been on a road trip since Tuesday, Aug 29. Not driving all the time, but have put on approx 1500 miles of mixed freeway, two lane, mountain, plains, calm, windy, rainy, town and country driving. I zeroed my lie-o- meter at the house and right now is showing average for the trip at 15.9. That includes I think 3 re-gen's. 30 MPH in towns up to 80 MPH on some freeways.
2016 F350 dually w/ 3.73 gears. I am happy.
 
 
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