Gas vs PSD
Postmaster
Joined: Apr 2006
Posts: 3,524
Likes: 2
From: CA Bay Area
Between oil changes I spend about $3000 on fuel for my PS.
That is easy saving of over $1000 comparing to V10 in the same truck. I think I can afford to spend $100 extra on oil change. Just put Mobil1 synthetic in it and send old samples to Blackstone. The good workhorse deserves it.
That is easy saving of over $1000 comparing to V10 in the same truck. I think I can afford to spend $100 extra on oil change. Just put Mobil1 synthetic in it and send old samples to Blackstone. The good workhorse deserves it.
Postmaster
Joined: Apr 2008
Posts: 4,724
Likes: 4
From: Rogersville, TN
Another reason I like the diesel is the durability. I was wearing gassers out every 6 months and I got tired of buying new ones. I would buy a good used one with 70-75k miles on it and in 6 months it would be at 125-150k and worn out. My 5.0 is still going strong at 220k, but all my other high mileage(125k) gassers either limped to the dealer to get traded in or have the engine sitting in my garage waiting to be rebuilt.
Postmaster
Joined: Apr 2008
Posts: 4,724
Likes: 4
From: Rogersville, TN
Stay out of the turbo, don't floor it to pass people and take your time pulling out from a stop and you can get just as good mpg's towing as you do empty. I have an open trailer, so there isn't much wind resistance either. Once you get a load moving it doesn't take any more power to keep it moving(on the mythbusters mpg's episode) as long as there isn't much added wind resistance.
Edit-My 7.3 is also a bone stock OBS, reb cab, manual, XL with no options. The same as my 5.4, so a fair comparison as far as set ups go. I don't doubt your mpg claims either. There are too many variables in driving style, mods, trailer resistance, terrain, etc, to make a fair comparison. But both of my trucks pull the same trailer, on the same road, with the same driver, so it doesn't get much more fair than that. I make the same offer to anyone though. I will run a tank of gas out pulling what I say I pull and if I get the mileage I say I get, you fill my tank back up and then give me enough money to fill my next tank up for wasting my time.
Edit-My 7.3 is also a bone stock OBS, reb cab, manual, XL with no options. The same as my 5.4, so a fair comparison as far as set ups go. I don't doubt your mpg claims either. There are too many variables in driving style, mods, trailer resistance, terrain, etc, to make a fair comparison. But both of my trucks pull the same trailer, on the same road, with the same driver, so it doesn't get much more fair than that. I make the same offer to anyone though. I will run a tank of gas out pulling what I say I pull and if I get the mileage I say I get, you fill my tank back up and then give me enough money to fill my next tank up for wasting my time.
Postmaster
Joined: Apr 2006
Posts: 3,524
Likes: 2
From: CA Bay Area
Well... Josh you are killing the thread.
After several thousands replies, the gaser owners lost the final arguments
I can only confirm your observation that diesel mpg drop while hauling is minimal. With 9000 lb forklift on flatbed my mpg dropped about 5%.
With 5000 lb lowboy trailer with dovetail, my mpg seems to even increase. I tow it slightly slower, so that is a factor, but I am planning to check it farther.
After several thousands replies, the gaser owners lost the final arguments
I can only confirm your observation that diesel mpg drop while hauling is minimal. With 9000 lb forklift on flatbed my mpg dropped about 5%.
With 5000 lb lowboy trailer with dovetail, my mpg seems to even increase. I tow it slightly slower, so that is a factor, but I am planning to check it farther.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
I have done the math, with the number of miles I drive the 7.3 would be a very slight savings in cost. But when you start looking at things breaking as it ages, the V10 is still ahead on repair cost.
The V10 has all the durability of the 7.3. You would not wear one out like your other gassers.
The V10 has all the durability of the 7.3. You would not wear one out like your other gassers.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
Thats about the fuel mileage my V10 gets.
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Postmaster
Joined: Oct 2006
Posts: 4,171
Likes: 12
From: SE Texas
Well... Josh you are killing the thread.
After several thousands replies, the gaser owners lost the final arguments
I can only confirm your observation that diesel mpg drop while hauling is minimal. With 9000 lb forklift on flatbed my mpg dropped about 5%.
With 5000 lb lowboy trailer with dovetail, my mpg seems to even increase. I tow it slightly slower, so that is a factor, but I am planning to check it farther.
After several thousands replies, the gaser owners lost the final arguments
I can only confirm your observation that diesel mpg drop while hauling is minimal. With 9000 lb forklift on flatbed my mpg dropped about 5%.
With 5000 lb lowboy trailer with dovetail, my mpg seems to even increase. I tow it slightly slower, so that is a factor, but I am planning to check it farther.
I have a 2005 Excursion 4WD. 3.73 axle,2V 6.8L,4R100.
Running on the highway solo,it gets 15mpg.
In town it gets 12.5mpg.
Towing my 8000ish lb travel trailer is gets 9-10mpg depending on traveling speed and wind.
My good friend has the IDENTICAL same Excursion in a 2001 7.3L.
SAME gears, SAME trans, SAME 4WD.
Running on the highway emtpy-he gets 17mpg.
In town he gets 14mpg.
Towing a travel trailer the same length,profile and weight as mine-he gets 9-10mpg.
JL
Postmaster
Joined: Apr 2008
Posts: 4,724
Likes: 4
From: Rogersville, TN
I have done the math, with the number of miles I drive the 7.3 would be a very slight savings in cost. But when you start looking at things breaking as it ages, the V10 is still ahead on repair cost.
The V10 has all the durability of the 7.3. You would not wear one out like your other gassers.
The V10 has all the durability of the 7.3. You would not wear one out like your other gassers.
If you compare the common parts that wear out as a vehicle ages, the 7.3 costs the same as a v10. Look up the prices on alternators, starters, water pumps, etc. I have priced them at several different places and my 5.4 and 7.3 are always within about $10 of each other.
Postmaster
Joined: Apr 2006
Posts: 3,524
Likes: 2
From: CA Bay Area
Looks like the mentioned samples of PS are bad engines. I was getting 9 mpg with this set towing at 61 mph with couple of mountains peaks to pass.
What you see on the picture is easy 25,000 lb. Won't even comment on aerodynamics.
Heck -slim chances the motorhome driven alone would get that mpg on its gas engine
What you see on the picture is easy 25,000 lb. Won't even comment on aerodynamics.
Heck -slim chances the motorhome driven alone would get that mpg on its gas engine
Postmaster
Joined: Apr 2008
Posts: 4,724
Likes: 4
From: Rogersville, TN
Edit-As far as gassers losing more mpg's when loaded than a diesel, there is a simple reason for that in my case. On flat ground, you would be correct. With my car hauler I can cruise along in 5th gear with either my 5.4 or my 7.3 on flat ground all day long and barely see a change in mpg's in either of them. The problem is, there isn't much flat ground around here. At 65 mph my 7.3 is right in the middle of its power band and doesn't have to downshift when I hit a hill. My 5.4 has to downshift and turn 4000 rpm to make the same power my 7.3 does at 2500 rpm. That uses a heck of a lot more fuel.
Postmaster
Joined: Oct 2006
Posts: 4,171
Likes: 12
From: SE Texas
My figures are real world figures too. You are forgetting one thing though. Your real world figures have two different drivers and two different trailers(similar, but not identical). My real world figures have the same size truck, same gears, same tranny, same 4wd, exact same trailer and the same driver. I am also pulling a trailer that has virtually no wind resistance and you aren't. I welcome you to come along for a ride anytime you want to. If you are ever in this area just look me up.
JL
Hotshot
Joined: Dec 2006
Posts: 14,069
Likes: 17
From: Melbourne, Ky
The OBS's do typically get better mileage over the super duty's, assuming you have the same setup as far as tranny and differentials. A manual tranny 2 wheel drive will do better than a 4X4 with an automatic too. Drivers habits do need to be taken into account too.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
And I can refute that with real world figures.
I have a 2005 Excursion 4WD. 3.73 axle,2V 6.8L,4R100.
Running on the highway solo,it gets 15mpg.
In town it gets 12.5mpg.
Towing my 8000ish lb travel trailer is gets 9-10mpg depending on traveling speed and wind.
My good friend has the IDENTICAL same Excursion in a 2001 7.3L.
SAME gears, SAME trans, SAME 4WD.
Running on the highway emtpy-he gets 17mpg.
In town he gets 14mpg.
Towing a travel trailer the same length,profile and weight as mine-he gets 9-10mpg.
JL
I have a 2005 Excursion 4WD. 3.73 axle,2V 6.8L,4R100.
Running on the highway solo,it gets 15mpg.
In town it gets 12.5mpg.
Towing my 8000ish lb travel trailer is gets 9-10mpg depending on traveling speed and wind.
My good friend has the IDENTICAL same Excursion in a 2001 7.3L.
SAME gears, SAME trans, SAME 4WD.
Running on the highway emtpy-he gets 17mpg.
In town he gets 14mpg.
Towing a travel trailer the same length,profile and weight as mine-he gets 9-10mpg.
JL
The V10 comes out ahead too.
