I traded in my 07' Sahara a couple weeks ago for a 12' Unlimited Sport. Finally! A Wrangler than can keep up with highway traffic with little or no effort! I have to admit before I jumped in my JKU I was very skeptical but when I spun BOTH rear wheels going into a turn I was ready to buy before I made it to the next traffic light.

This Jeep accelerates EFFORTLESSLY. Two weeks later and I'm still grinning at the fact that I can cruise at 40mph, even uphill, and barely have my foot on the accelerator. My JKU grunts like a diesel engine under mild acceleration and screams almost like a Hemi under hard acceleration. When walking around the JKU at idle it sounds like a v8.

This JKU can easily, easily hit 80mph upon entering highway traffic and serge past 100mph in no time flat. I'm estimating by the distance the needle went past 100mph that I must have gone at least 120 to 130mph. I haven't had a chance to go off-road yet due to making a big move into a new house. Neverthless, I know this engine will be a big improvement. My old 3.8 liter simply could not handle slow approaches to drastic inclines without choking and sputtering, and in some cases even halfway up a hill it would choke or sputter.

Gas mileage has been better than the factory estimated 17 city/ 20 hwy. For the first couple days I was averaging 16mpg but after hitting over 100mph on the highway I started clocking 20 to 21mpg. Now I'm averaging 18mpg and climbing on a daily basis.

 

Dammit, people! Stop posting this crap! It's gonna end up costing me money!!()










Just kidding. I do like the 3.6/5 speed auto combination.

And thanks for pulling your engine for the photo shoot. (Get those Rubicon stickers off your Sport, too.)

 

So you bought a new Jeep and the first thing you did is pull the engine out to admire it?!

Grats on your purchase!

 

Mine is almost a week old and I'm only getting 17.2 mpg on hwy and havnt broken 75mph yet. Maybe I need to open her up a bit (120 mph) and see how she does. Haha. Thanks.

 

Yep. It only took 3 days. All I used was a $20 rachet set from Autozone and the factory jack.

Actually, here's my JKU:

 

I was averaging between 16-17 mph myself until I opened it up on the highway. Here's my MPG meter readings afterwards:

http://youtu.be/U01qu-kEe5M

 

Congratulations on the new JK and the new house.
You are right .The new engine does feel different .

 

I know its WAAAAYYY better OP, but really? 130 MPH?? c'mon man... But hell IDK, but thats beyond impressive if true.

 

Gonna go on another run down the highway in the morning. I'll record it next time. It's just a rough estimate but the needle was well past 100mph at the bottom of the guage and it STILL felt like it could go faster. I was shocked, SHOCKED I TELL YA, that no governor kicked in when I went past 100mph.

 

I wouldn't put much stock in that reading. My last fill up it said 17.something mpg for the tank and I calculated it out to 15.4 mpg.