The J8 thread....

[Metcalf]

If you look at the article in Autoweek and my quote, they got a best of 27.5 mpg with the speed in the 55-60 range. That isn't bad at all in my opinion. And I don't think the AEV J8 was THAT broken in at that point....

My Dodge is 7000lbs and gets 20mpg with 39s. The J8 will do better I think under real world driving....especially slow calm expedition driving.

 

[JDaPP]

I would think the J8 also is affected by how the electronics are programmed. I know I had the ECU reprogrammed on the Jeep Liberty CRD and that added another 2mpg on it. I would imagine that the J8 probably could be tuned to get better mileage results.

 

[Metcalf]

Today was a J8 day.....sigh.

 

[Scott Brady]

I have heard many people claim that their diesel kj's get close to 30 mpg once they are broke in, I would think that the j8 would be in the same boat.

We are getting 22-25 at moderate speeds on the highway. In mixed driving, we are getting 18-20 mpg. Over 75-80 on the highway and it gets about 18.

 

[Metcalf]

Is that with the camper and extra weight? If so...thats not bad at all. The speed definitely costs you mileage, especially with a diesel. Most expedition driving is done at 45mph or less....once you get off the main tracks.

 

[Scott Brady]

Interestingly, the camper changes nothing on the mileage. I am sure fully loaded it would, but just the top changed nothing.

Originally, this truck had a roof rack, which cost about 1.5 mpg.

 

[Metcalf]

Good to know. Sounds like the mileage is more aerodynamically driven than weight driven. Mileage goes down as speed goes up, rack-loss gained milege, etc.

 

[Scott Brady]

Good to know. Sounds like the mileage is more aerodynamically driven than weight driven. Mileage goes down as speed goes up, rack-loss gained milege, etc.

Agreed. Huge reduction comes with high-speed. If you can cruise at 60-65, the mileage is awesome.

 

[alosix]

Today was a J8 day.....sigh.

?

 

[Metcalf]

I was driving my dodge....though I love it.....thinking about having a J8. Its basically about the same thing, but 3/4 scale. It fits the almost perfect requirements that I want ( the J8 ), a full size truck like my Dodge is just a bit to wide and long. The J8 could still do most things my Dodge does ( haul/tow ), but allow me to get farther off the road and into tighter places.

 

[XXXpedition]

Originally Posted by Metcalf
Good to know. Sounds like the mileage is more aerodynamically driven than weight driven. Mileage goes down as speed goes up, rack-loss gained milege, etc.
Originally Posted by expeditionwest
Agreed. Huge reduction comes with high-speed. If you can cruise at 60-65, the mileage is awesome.

having a pumped up diesel JK i have to agree to some point. but city driving is even worse than 70mph. i always take it easy on the pedal at cross lights - keeping up with LA traffic (for exsample) will kill your milage too.

my truck has about 45k on the clock (broken in ;-)) and gets between 20-22mpg in any situation (that said: it is lifted 4" has 35"s with 4.11 gearing and the roofrack empty) without the roofrack i'm closer to 22mpg...
sven

 

[Dan Grec]

having a pumped up diesel JK i have to agree to some point. but city driving is even worse than 70mph. i always take it easy on the pedal on cross lights - keeping up with LA traffic (for exsample) will kill your milage too.

my truck has about 45k on the clock (broken in ;-)) and gets between 20-22mpg in any situation (that said: it is lifted 4" has 35"s with 4.11 gearing and the roofrack empty) without the roofrack i'm closer to 22mpg...
sven

Are those metric gallons (4.5L) or imperial gallons (3.8L) ?

Sounds like the roof rack is a real drag...

Thanks,
-Dan

 

[XXXpedition]

yes, the rack's a drag.
i used to live in the USA so i always use their mpg (imperial gallons)
in other words between 10-12 L/100km

 

[reece146]

Are those metric gallons (4.5L) or imperial gallons (3.8L) ?

US Gallons = ~3.8 liters

Imperial Gallons = ~4.5 = "Metric/1964 Canadian/1985 UK" Gallons

http://en.wikipedia.org/wiki/Gallon

http://www.tdiclub.com/misc/conversions.html

 

[Dan Grec]

yes, the rack's a drag.
i used to live in the USA so i always use their mpg (imperial gallons)
in other words between 10-12 L/100km

Thanks again for the info.

Hmmm, with figures like that from the rack, I really might have to think of some alternative way, but how to fit everything inside?
And no Roof Tent is a big minus.

When you had your CRD tuned, I know you bumped the torque/power up quite a lot, I'm wondering if there was anything different you could have done specifically for "economy"? I imagine having more torque improves the economy across the board, so long as you drive it conservatively.
Leaning it out from stock might not be so great for long-long-term reliability.
(is that an issue on diesels? I don't know)

-Dan