Topping Off
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Joined: Dec 2012
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Topping Off
Fueling my pervious PS's 1997 & 2008 Icould fuel to the top of the filler, without too much of a problem ordelay. That way I could get an accurate MPG calculation. Mypurchased new, 8000 mile, F-350 PS is almost impossible to fill unless you wantto take a half hour to do so. What it does is fill to the top then drainsback into the tank. Yesterday was the first time I topped it off and like Isaid it took almost a half hour. With the small tank that extra fuel doesmake a difference and does give an accurate MPG figure. Does anyone elsehave this problem?<o
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Logistics Pro
Joined: Mar 2005
Posts: 3,557
Likes: 2,515
From: West Michigan
its not as big a deal as it was in the older trucks. For me, in my 2005, I could get a few more gallons in. I know a lot of guys did the "harpoon" mod on those years. In my 2011, its only a gallon at most, usually less. I find myself topping off occasionally out of habit, but it really isnt necessary anymore.
I've learned to just trust the computer as the gallons used is always within a .10 or so of pumping it in.
I've learned to just trust the computer as the gallons used is always within a .10 or so of pumping it in.
Junior User
Joined: Apr 2013
Posts: 97
Likes: 0
From: Boerne TX
Hmmm wierd, my read out is always over by 1mpg and when I top it off it is almost where the clicker stops at. Mine won't take but maybe 1/10 of a gallon after the click, it's right at the top of the neck.
Post Fiend
Joined: Oct 2002
Posts: 11,314
Likes: 4
Since I'm driving an 8800 lb square box that sometimes runs around @ 23,000+ lbs towing,
I'm not overly concerned with mpg...
besides that, the fuel gauge, DTE, the computer, but mostly my wife, does a good job of warning me when I'm about to run out of fuel
I'm not overly concerned with mpg...
besides that, the fuel gauge, DTE, the computer, but mostly my wife, does a good job of warning me when I'm about to run out of fuel
FTE Chapter Leader
Joined: Sep 2011
Posts: 63,241
Likes: 6,669
From: Great Falls, Montana
I made a trip to Tucson AZ and back with the F-350 and the 33ft 5th wheel (about 13k lbs). 2800 mile round trip. Many 6% grades.......75 mph cruse speed coming home......10.4 Miles per Gallon. Going there...65 mph cruse speed....11.5+ miles per gallon.
The truck does well.........
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Post Fiend
Joined: Oct 2002
Posts: 11,314
Likes: 4
It IS a towing machine - but 75 with THAT weight ?!?!
hope you don't have ST tires limited to 65 mph on that 5er then ?
(but when it's not summer and really hot, I will bump the rv's tire pressure up and run 'quickly', but not usually )
hope you don't have ST tires limited to 65 mph on that 5er then ?
(but when it's not summer and really hot, I will bump the rv's tire pressure up and run 'quickly', but not usually )
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FTE Chapter Leader
Joined: Sep 2011
Posts: 63,241
Likes: 6,669
From: Great Falls, Montana
I figured that since the trailer was behind the Truck......it must have been going slower.........maybe about 65mph........
........
Seriously.....you do have a valid point!
FTE Chapter Leader
Joined: Sep 2011
Posts: 63,241
Likes: 6,669
From: Great Falls, Montana
The weight was just not a problem........the Truck towed (at 75) uphill (6% grade ) without any heat problems nor lack of power.
Trailer tires speed rating.....??.........I must admit, I do not know what my tires are rated for.
Trailer tires speed rating.....??.........I must admit, I do not know what my tires are rated for.
Hotshot
Joined: Jul 2005
Posts: 13,834
Likes: 26
From: Middle Tn.
If you ever spin a tread at that speed you can kiss that side of the trailer bye-bye if your lucky.
FTE Chapter Leader
Joined: Sep 2011
Posts: 63,241
Likes: 6,669
From: Great Falls, Montana
But...ya know, this is not the subject of this thread anyway. And which university did you get your Ph.D in physics??
Senior User
Joined: Jan 2006
Posts: 435
Likes: 87
From: So Cal
Roy, most trailer tires are rated for the weight expressed at pressure and 55 MPH.
decreasing air pressure or running faster causes the tires to heat up and fail.
Best thing you can do is upgrade to ribbed style tires and keep the needle at 65 or less.
decreasing air pressure or running faster causes the tires to heat up and fail.
Best thing you can do is upgrade to ribbed style tires and keep the needle at 65 or less.
FTE Chapter Leader
Joined: Sep 2011
Posts: 63,241
Likes: 6,669
From: Great Falls, Montana
The Tire and Rim Association, Inc. (TRA) is the standardizing body for the tire, rim, valve and allied parts industry for the United States. TRA was founded in 1903 and its primary purpose is to establish and promulgate interchangeability standards for tires, rims, valves and allied parts.
I have seen so many experts on FTE telling people what they need to know about weight limits, towing limits, tire limits and safety. The BIG problem (for me) is that the information in not consistant, is not backed by verifiable sciencetific research......So what is one to believe??
Common Sense does play a part......but only if it is based upon sciencetific research.
RV Trailer tires are typical rated for 65 mph...At the Full load with the recommened air pressure. The standards go on to say: At the fully rated load the tires are rated for 75 mph with a 10psi air pressure increase.......Also, the tires are rated for 75-85 with full air pressure and a 10% reduction in load.
So, the blank statement that the world is going to end if you pull a trailer faster than 65mph is just plain untrue.
The axles on my 5th wheel (and therefore tires) are not loaded to the max load capability of the axles and tires. I keep the pressure at max recommened. I monitor the temp of all tires. I drive for the traffic and road and weather conditions....
I might drive at 65 on a 80mph posted road. Traffic, weather (to include temperature) road surface material and condition. I might drive at 70mph. I do feel, for me, that 75 mph is plenty fast enough no matter how great all the factors are. I do choose to drive at 65 most of the time for the sake of fuel cost. There are some roads that are posted at 70mph here in Montana that I am comphy with 60 mph. I do keep in mind that, too slow can cause or contribute to some nasty accidents and is illegal in some states.
Be safe....be reasonable.......don't hurt people.......How you do this is up to you.