Ecodiesel Eco-nomics & Issues

[TX_Ovrlnd]

At least the fill port is in an easy to access location. My 2017 GMC had me getting into the engine bay.

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[BigGreen]

Whatever you do, make sure you over think it.

Diesel if you put on a lot of miles
Gas if you put on moderate miles
Hybrid/EV if you don't put on a lot of miles

 

[STLJonny]

@Gorilla57 nailed it. DEF consumption should be around 3% of fuel.

JL has a 5.1 gallon DEF tank. I have to fill mine every 3000-3300 miles. My 2018 Grand had an 8 gallon tank but I only had to fill that every 9-10k miles. When I got the JL I thought something must be wrong because I was having to fill the DEF tank so often but it has been within spec.

Looping back on that usage %, it does look spot on now that you mention it. ~2300 miles, I was down to 1/4 tank of DEF. That puts me ~3.5 gallons down (if using the 3% calculation if I was in the 22-25mpg range). I guess that's the rule of thumb I will use from now on.

 

[Terpsmandan]

How do you like the GDE tune? I've looked into it just a little but didnt see many posting about it

Very happy with the GDE tune. I was getting 21 mpg after I had the lift and 37’s installed and after getting the tune, I’m averaging 23 mpg and if I launch it at 3000 in 4x4 I can get to 60 in less than 6 seconds. My commute to work includes a section of 4 lane divided highway with a speed limit of 55 and 4 traffic lights. If I get pole position at the red light, left foot brake, rev it to 3000 in 4x4 and green light and gone. Never get tired of that. On the brakes the torque will rock the jeep to the right. If you leave it in 2nd you’ll smoke the tires. JLDiesel on YouTube had his done in January. Check his video.

 

[brewski]

The immediate convo is not complaining but lots of people complain about having to put def in.

I don't get the complaints. Yes dealing with those boxes is annoying and not fun and if you had a diesel from the early 2000s then yeah today's diesels are massively different. I keep a box of DEF around and take one on long remote trips in case I run into a problem (No DEF, no running the engine = yikes!). I monitor my DEF level on my iDash and it is surprising how much that sensor jumps up and down (20% sometimes). So if you were running a little low and parked on a hill it is possible you could have enough DEF, but your tank sensor is reading the level too low to let you start your engine.
If you go to a truck stop the DEF via pump is super easy. And since you only have to fill up every 3000-5000 miles it is pretty easy to go by a truck stop in that time.

 

[IQ_imbalance]

I'm at ~4400 miles, and just topped off with my second 2.5 gallon jug of DEF

 

[treillw]

I don't get the complaints. Yes dealing with those boxes is annoying and not fun and if you had a diesel from the early 2000s then yeah today's diesels are massively different. I keep a box of DEF around and take one on long remote trips in case I run into a problem (No DEF, no running the engine = yikes!). I monitor my DEF level on my iDash and it is surprising how much that sensor jumps up and down (20% sometimes). So if you were running a little low and parked on a hill it is possible you could have enough DEF, but your tank sensor is reading the level too low to let you start your engine.
If you go to a truck stop the DEF via pump is super easy. And since you only have to fill up every 3000-5000 miles it is pretty easy to go by a truck stop in that time.

With the boxes of DEF, there is no way to know how full it is and when it is ready to overflow onto the side of the jeep, correct? (besides doing some math)

 

[TX_Ovrlnd]

With the boxes of DEF, there is no way to know how full it is and when it is ready to overflow onto the side of the jeep, correct? (besides doing some math)

You can kind of go by sound, like using a fuel pump with no auto shutoff but it isn’t exact.

 

[BroncoHound]

I reckon if I was using boxes, I would just put one in when the gauge hit 1/4 tank. Should take it back to 3/4 tank. No shutting itself down, no overfilling. As it stands, I drive by a truck stop every day so I used it the first time I filled and haven’t needed a second time yet.

 

[grimmjeeper]

With the boxes of DEF, there is no way to know how full it is and when it is ready to overflow onto the side of the jeep, correct? (besides doing some math)

I wait until I'm at 3/8 to 1/4 tank and dump in a box. Never over filled it yet.

 

[brewski]

With the boxes of DEF, there is no way to know how full it is and when it is ready to overflow onto the side of the jeep, correct? (besides doing some math)

People like to complain. If using a box I make sure I’m below 1/2 tank and add when I’m between 3/8-1/4 tank. Doesn’t overflow that way. Pretty simple solution. The boxes are awkward to dump into the tank, and get it all out… but Jerry cans filled with fuel are just the same. With a Jerry can of fuel you can also over fill if you’re trying to put too much in

 

[HBDiesel]

When we test drove the 2.0,3.6 and 3.0 diesel. The diesel was the easy choice. No way a high compression engine with a turbo can run 87 over a long period of time it’ll be pulling timing to survive. 3.6 is what 11.4:1 it’ll pull timing also with 87. Making gas equal cost/ MPG a Diesel advantage, Jeeps are fairly heavy and once you install bigger tires them gas engine will be in the teens at 75 mph. (Diesel is currently getting 27 at 75)
2.0 sounded like it was running on the ragged edge of disaster. Diesel accelerated with ease, extra insulation so it’s also quieter, larger brakes, Beefier suspension and axels. Diesel was the easy choice.

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