MPG Experiment

[ShadowsPapa]

happy to see another dueler at fan! I think they get a bad rapport being oem...I certainly balked at them initially. Which cost me when I swapped back haha

If the premium bumper is the same pumper in the pic below ( Ill add it in a moment from my phone if you read this before i post the pic) then they will not. They only fit the standard bumper in the picture in the first post.

Now another fella, I think in this thread, said he would make something that would work. May be worth a collaboration between the two of you that if he is able to make something worth it you share the cost of his R&D. Just food for thought.

Duellers may get a bad rep because the Dueller H/T is the first thing that comes to mind for many "Jeep people". Bridgestone tires are good tires, the H/T, though is for comfort and MPG and ride. They are not good for Iowa winters (or other locations for that matter).
I've been really impressed with the general A/TX tires I have - excellent in snow and snow pack and icy patches. I went with them not because Bridgestone is bad at all, but the reviews and comments on the A/TX were nothing but extremely good and I could only buy so many sets of tires at a time.

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[Gren71]

Hypoid gears - higher friction when new, then the burnish and smooth and "break in" - I hope nothing exploded and that chunk isn't like 1/2" diameter or anything - but honestly, even on my 193,000 mile differential a while back, the only thing that came out was old fluid, maybe a bit of sparkle to it if you looked REALLY close (and that was with a B-B size piece out of one of the carrier bearings!)
So you should see nothing coming out, no flecks, no flakes, no sparkles, and definitely nothing chunky. Dark is ok, chunky, not so ok.
Good luck and really am looking forward to what you come up with. Few would be so brave as to, in public, no less, try for mpg instead of how tall you can lift it and still get in and see the road.

The service tech just called back and said that 2nd gear is shot. Im wondering if maybe this could cause the JT to drop back in gears easier on inclines and such...I know thats now how it works. but iv always thought that it shouldn't drop back to 7th, or even 6th, when it does. So who knows. with that in mind...im wondering if they mean my transmission and not my rear dif...since there isnt a second gear in my diff

But ill ask for clarification when they call me back...just taking what she said at face value is my own fault since my 2 year old was torturing my 7 year old while I was on the phone.

The shop is waiting on final approval from my extended warranty since apparently the powertrain only goes to 60,000. I thought it went longer. Glad to have the extended warranty! So much so that I may buy another one once this one expires. They shouldn't deny the fix, but who knows. Time will tell.

PS:
LOVED my general grabber at2s on my old KK. Those things were monsters in all conditions.

 

[Ogre_FL]

Here's another reason I'd like those gap-fillers (aside from MPG) -
A lot of the stuff that comes at my windshield is from my own front tires. I have watched as spray on a dirty road is thrown forward over the bumper by the tires and the air flow turns it and blows it right back at me! It's weird and cool to watch the spray being shot forward from the tires stop, and almost in slow motion, change direction and come up over the hood and fenders at me.

The top of the bumper ends is always loaded with sand and mud and slush.

I've got one of each.
While the one with the gap fillers does allow less crap through, its pretty amazing just how much makes it through that little gap between it and the fender.
The tops of each of the bumpers get covered with crap and both throw it up into the windshield.

 

[Gren71]

I've got one of each.
While the one with the gap fillers does allow less crap through, its pretty amazing just how much makes it through that little gap between it and the fender.
The tops of each of the bumpers get covered with crap and both throw it up into the windshield.

the rims on the wrangler are the ones im having installed! haha Theyre gonna look good on the JT. You dont see them around often, at least not around me.

 

[Kevin_D]

If the premium bumper is the same pumper in the pic below then they will not. They only fit the standard bumper in the picture in the first post.

Now another fella, I think in this thread, said he would make something that would work. May be worth a collaboration between the two of you that if he is able to make something worth it you share the cost of his R&D. Just food for thought.

The bumper on the right, which is the same as the one i have on the gladiator now, is the only one I’m aware of that can take the Euro air dams. If the bumper on the left is the “premium “bumper then it cannot take them.

Yeah, my bumper is like the one on the left in this picture.
I've read about a guy that fabbed up something using plywood, but he was only using it when towing his Wrangler, to keep stuff from spraying all over!

Kevin

 

[cotnballs2000]

0.5-1 mpg is within the margin of error, difference between days with different wind speed and temperatures, lets be real. Also you have to check tire pressure before you drive every single time (leaving and coming home from work). You would have to do this for a long time and collect way more data to make it useful.

 

[Imbuere]

It’s great to see people concerned with fuel mileage.

I get so tired of the “It’s a jeep thing! Drrr!” responses any time I mention gas mileage or NVH.

I think over time I’d like to make a light aero kit for my JL. Wheel well dams, front lower bumper dam, side skirts, and even those semi trailing edge things I see on the trucks are all things I’ve considered.

 

[Gren71]

0.5-1 mpg is within the margin of error, difference between days with different wind speed and temperatures, lets be real. Also you have to check tire pressure before you drive every single time (leaving and coming home from work). You would have to do this for a long time and collect way more data to make it useful.

what margin of error? I think you're assuming that there are wild variations in things that are considered controls. My tire pressure is consistent (+/- 1psi at start up), and weather is a factor in the experiment. But the weather is also largely consistent with the data collected. So there shouldn't be a huge margin of error when the only data i am going to use has to fit within the parameters of the experiment. Certainly not enough to discount a 0.5-1mpg change.

I intend to collect a pretty decent amount of data, at least once the jt is back from the doctors visit and is back to normal operation.

Like I said in the first post, this isnt my field of expertise, so if there is something ive overlooked please fill me in. Iv already enjoyed my dive into physics from the first couple pages of the thread.

 

[cotnballs2000]

You shouldn't be throwing out data when it doesn't meet your perceived expectation, it should be used. When you graph your data, it becomes more apparent and then you can analysis all the data and massage it out with the math. Just from the graph alone you can see a downward trend in your MPG without the two data points of 20.5 that you didn't want to use. Also, according to the data, you do have deviations that are within the .5-1 mpg accuracy you are looking at so far. I would set up excel and use a similar graph to track the data. If it was me I would also document weather as well as the amount of fuel in the tank and use it in the graph etc. Where are you getting the MPG from, the computer uses a formula to give you MPG and it isn't "real time”. A cell phone app with GPS would be the best option IMO.

 

[Gren71]

You shouldn't be throwing out data when it doesn't meet your perceived expectation, it should be used. When you graph your data, it becomes more apparent and then you can analysis all the data and massage it out with the math. Just from the graph alone you can see a downward trend in your MPG without the two data points of 20.5 that you didn't want to use. Also, according to the data, you do have deviations that are within the .5-1 mpg accuracy you are looking at so far. I would set up excel and use a similar graph to track the data. If it was me I would also document weather as well as the amount of fuel in the tank and use it in the graph etc. Where are you getting the MPG from, the computer uses a formula to give you MPG and it isn't "real time”. A cell phone app with GPS would be the best option IMO.

Fair

The reason that I excluded those two data points is that the weather posed a significant change to the conditions. And my experiment is focused on trying to keep the weather as similar as possible so it is not a variable that needs to be accounted for. A head, or tail, wind of 10mph + certainly would make enough of a change that it would show in the date. Which you can see when you include those two data points.

Same with fuel tank level since then we get into the overall weight of the truck and such..i dont really want to have to weigh my self before I drive every day haha. and though the fuel weight could make a difference, im more interested in the aerodynamics side. I can certainly add that as a data point and make sure the tank is at least half full before data is collected.

This is definitely a broad stroke look at things. But im trying to both keep it simple, and keep the data collected limited to specific criteria.

 

[BaliMawr]

Yeah, my bumper is like the one on the left in this picture.
I've read about a guy that fabbed up something using plywood, but he was only using it when towing his Wrangler, to keep stuff from spraying all over!

Kevin

I fully intend to make some gap-fillers, with an eye toward not being ugly as sin... after I take delivery in a month or so. ?

 

[Gren71]

I just had to make the drive up to my station to get my equipment for work. I took my wife's JL, which has the euro dams in, since the JT is OOS.

Just for fun I followed the same test parameters.

32d, no weather considerations, 3/4 tank at the start. The JL got 24.6mpg for the test track. Wild how much better the JL performs in general with the same engine as the JT. Its like driving a go cart in comparison haha

 

[BAT]

Well I haven't been going as deep as you have but just for the heck of it I have just done some poor mans testing. I drive to work twice a week and its 100 miles round trip. I have JT Max Tow, no lift, Rubi Take off AT tires, RR bumper, skid plate with smittybuilt synthetic 10k Winch. My trip is mostly all freeway but there are sections of Houston freeway that are just pure bumper to bumper for some miles. When not in that kind of traffic my trip is usually 65-70 MPH all the way. No crazy accelerations and no cruise control. The last 3 trips I have by the truck computer averaged 20.4 mpg. My recent trip to South Louisiana which was about 900 miles at 65-75 mph mostly all interstate driving I averaged a little over 22 mpg. Very little wind on any of the trips. My stuff was not nearly as in-depth as yours I just kept an eye on the speed and a few other factors then saw what the truck spit out. City driving is where I seem to take the biggest hit at on mpg.

 

[jeepstertim]

Thought I'd throw in my findings so far. The lower readings are linked to being used off road and the 14.9mpg includes the 10hrs of idle when I left it running overnight!! The high of 27 is linked to the tank not being filled and the following one is then lower to compensate.

My average since I've had it is 19mpg.

Petrol JTR on 35" with 1.5 leveling and AT.

 

[Gren71]

Got it back!!

Pleased with the new (to me) wheels

im giving the rear dif a bit to wear in before I start the experiment back up. Right out the gate though it feels just like it dis before it went down for service, which is nice.

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