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Old 07-27-2011, 01:41 PM   #41 (permalink)
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Quote:
Originally Posted by euromodder View Post
Fine, but then you've still added 2 or 3 gallons of oil to the fuel tank.
The oil is also burned as a fuel, so it should be taken into account.


If you added 2 gallons of oil, and later filled up with 20 gallons of fuel for say 200 miles, you didn't get 10 mpg.

You then used 22 gallons of fuels (oil + gas) for 200 miles - or 9.1 mpg.

Let me say again. It not going affect errors mileage. I am going make 1 more clear words.

I put 2-3 gal of used oil in tank then 2 miles drive to gas station, refill to FULL then reset mile trip then drive to do errands and work. Then go back to gas station and refill with straight diesel.

I saw 2-3 mpg more on HWY at same speed. When I go back to straight diesel I saw 2-3 mpg loss. It was run little cooler. Oil make run hotter more power.

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Old 07-28-2011, 01:46 AM   #42 (permalink)
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10 tanks now since the aero mod of smoothing out the stake body.
before: 14.53 @ 53 tanks.(i guess i did the mod during tank 54)
with the last aero modded 10 tanks averaging 14.23
currently @ 14.43 @ 64 tanks.



this is a success.even though the FE number is less,it's actually not.
things are a little more hard to follow with a work truck.let me explain.
if you look over the tanks since this mod,you'll see a couple things;
i used the A/C a lot.i had the chipper with me a lot as well.
both of these things are big hitters along with lots of heavy loads.
all these things were really bunched in on these particular 10 tanks.
so though the FE number was lower,there's no doubt to me that it would have been lower by a much larger margin had i not smoothed out the sides.

for all these big hitters all crammed into these last 10 tanks,yet only dropping the overall average just .1 MPG meanwhile,and only .3 during a heavy work spell w/chipper and a/c going!
also note;
when i have the A/C going,the dual e-fans are both full speed.

thanks guys!
though it may not look impressive in the numbers.i know my truck,and know it is.


still working on some ideas in my head for this one;

Quote:
Originally Posted by euromodder View Post
The top tube is also deflecting air down into the gap between the cab and the box. Try to prevent that - with small deflectors on the cab.
Same applies if you add something similar to the sides.

Close the gap aft of the tube


You'd still be pushing air as much in the gap aft of the cab as what you're pushing aside.
a bonus here will be less noise in the cab coming from that rear window too.i hear a lot of wind rushing down in there.
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Last edited by FORDF250HDXLT; 07-28-2011 at 02:00 AM..
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Old 07-28-2011, 09:03 AM   #43 (permalink)
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The IRS allows X-cents per mile for business use of a vehicle. I look at this truck and its' lowered fuel use and I "see" where actual costs are probably closer to that deductible number. This truck has turned into a money-maker what with the decline in op-costs. Good before, perhaps, but now "economical" (if I read the OP correctly).

Congrats!!

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Old 07-30-2011, 08:59 PM   #44 (permalink)
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16.48 mpg on my first tank with the front air dam.
2 mpg over my lifetime average.not too shabby hey?
i haven't seen them kind of numbers since before i converted to dual rear wheel!
........


ok so i threw one side skirt on.the side without the fuel tank fillers for now,since this was my last running board.
you can see how i angled it in behind the toolbox,but left a gap of course since it's a dump bed,the toolboxes are hooked to the frame and don't lift,but the skirts do,as i simply bolted them to the bed,so much easier install.
i'll probably give them the garden edging treatment on the bottom as well for the cleaner,finished look.though not sure if i'll hang 'em lower or just on top of the bottom section strictly for appearance.
i'll have to keep my eye out for super cab running boards now in the local buy/sell mags so i can do the other side low cost.
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Old 08-01-2011, 11:10 AM   #45 (permalink)
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If you can, extend the sides further down over the wheels - say down to the lower level of the toolbox - angling up aft of the wheels for tipping clearance.

The front of the box could do with more rounded corners - like the tube on the top.
It's probably better than a squarish slab, even if pushes some air in the gap between cab and dumpster.
A tube cut lengthwise in 4 quarter-circle "pies" (like the crosshairs of a gun sight) could do the trick with decent radius yet while still being narrow enough to clear the cab. Fill in the "open" side with plain sheeting.


I wonder what a tank @ 45mph without AC would be like
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Old 08-25-2011, 02:17 AM   #46 (permalink)
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Engine oil is a larger petro chain = more energy per gallon.

BTW Fantastic work FORDF250HDXLT, you've set the mark pretty high for our old IDIs.

Last edited by Marianna2003; 08-25-2011 at 02:32 AM..
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Old 08-25-2011, 03:15 AM   #47 (permalink)
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Quote:
Originally Posted by Marianna2003 View Post
Engine oil is a larger petro chain = more energy per gallon.

BTW Fantastic work FORDF250HDXLT, you've set the mark pretty high for our old IDIs.
Oh no! He dragged you here too! LOL
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Old 09-01-2011, 05:22 PM   #48 (permalink)
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Hey, I'm just keeping my eye on you guys. FORDF250HDXLT has been doing an excellent job of modding his rig and documenting it.

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