JohnnyQuik

The 5.7L Hemi has cylinder deactivation and is within 1 mpg of the 3.6 Pentastar.

Rednroll

The reason is because we would all want one and Chrysler would not be able to build enough of them.

Economics at work. Supply and Demand. No Hemi=Less Demand=Supply ok.

Flip94ta

So jeep certified a hemi wrangler with the EPA and it was only one mpg less? Got proof?

Look at a Durango to compare, the Hemi loses 3 city/3 less highway and 4 less mpg combined. That's terrible. Using that baseline a JKU auto would be 12 city 17 highway? That's a joke and I think Chrysler would piss of the greenies and receive alot of negative publicity in the process. Those numbers are VERY hummer like.

If they want to offer one I really wouldn't care, but I think it's bad business. I'd bet on a 5-10% take rate which seems low of the investment needed. Expect a "clean" diesel.

Spank

I doubt it's really a fuel economy thing. It's more likely a safety issue, especially in the 2-door.

JohnnyQuik

Simply comparing the rating between my GC with a Hemi and my JK. The GC has a 6 speed auto tranny that probably helps some. I do agree with you that demand wouldn't justify the expense. That's the real reason the JK has a single engine option in North America.

Flip94ta

As I mentioned you have to expect a huge mpg drop with a hemi JK, just like the GC and Durango. Taking 3/4 mpg off the sticker makes a bad situation worse and adds the cost of a Dana 44 as well.

I do think there's enough diesel demand at this time. VW proves that every month. When euro and usa standards match we'll finally get a legitimate diesel. And quite honestly I don't think we need a fire breather 300hp diesel. Something in the 200-240hp/300-350ftlbs would be great and Jeep needs a CAFE star so hopefully we'll see a 25+ mpg highway rating. Even a modern take on the 2.8 would be okay. It already makes 200hp and 340ftlbs in its best trim. Maybe make it in a lighter carbon graphite iron block and keep the Dana 30 a viable option on non rubis.

ranjr

This is what I get now with my 3.6L. I get better mileage in my '01 Suburban with the 5.3L and 180K miles. I'd take a V8 any day!

cgnjeep

Is the fuel efficiency of a Rubi that much lower than a sport???.... My 3.8L averages 22.5mpg on stock 32" tires and the pentastar is supposedly more fuel efficient...

Jeek.OlllllllO

Check this with my x model with 4:10 gears i was getting about 14miles per gallon at the highest and then with i put a dynomax muffler and k&n air filter and it went up to 16 rubi take offs it droped to 14 miles per gallon my jeep is horrible with gas :/

ACiDisBAD

Wow, 22.5mpg?? I have a sport 6spd on 265/70/17 terra grapplers and the best I've seen was 18mpg and I was ecstatic. I average 16.9mpg.