My dad's car has the same w5a580 auto trans, the same or worse power:weight ratio and acceleration times but doesn't slow down the way my JKU does. Which is what got me thinking.
I've never put the jeep to N while moving at 40-60mph but I'm sure things won't change much.

 

Sounds like an interesting idea. Also how exactly does it drive better on road or did you mean in 4H/4L?

 

Aerodynamics and tires have an effect but it's basically all controlled by the computer on FI vehicles. I had a Buick Park Avenue that barely slowed down at all when the accelerator was released.

 

I know exactly what the OP means. I have a 2 door with the 3.6 and sometimes I just wonder if my ebrake is dragging because it "feels" like something is holding it back. Nothing sciencentific in my analysis. ..just strage as the OP stated.

I have an auto w/ 3.73 gears and stock rubi MT tires. Nothing else.

 

Keeping an engine "in gear" down hill will save fuel. When you "declutch" it will be at idle, using fuel to stay running. When in gear it needs no fuel to continue turning.

Edit: forgot to add a link. It is based on semi trucks. However the same rules apply for everything on the road:

https://www.nptc.org/index.php?optio...419&Itemid=527

 

With my jeep, it felt like my rolling resistance was greatly reduced after I got rid of the stock driveshaft and went with a Coast 1310. I think the bearings were going and it was creating some drag.

 

Can't be my issue... mine has under 4000 miles.

 

Throw some 35x12.50 MTR's with Kevlar and add the 4.10 gears I have and you will find out about rolling resistance and terrible gas mileage but hey we don't buy and modify these JEEPS for gas mileage or reducing rolling resistance.Throw some heavy bumpers and winches and it gets even better at about 12 mpg...but damn it looks badass and rocks the trails like nothing else out there!

 

Damn... yours sound like one heck of a build and I wouldn't mind having one like yours at all. The problem is my requirements and situation is very different from yours (as described in the first paragraph of the first post). Also, too often people underestimate the modern Wrangler's capability as a road vehicle... to me it makes perfect sense as a road-only vehicle as well and if i go to discuss why now this thread will go off topic too fast. At any rate, our beloved JK deserves a bit more credit

 

Even mine does it running 35s and 4.88s gears. I kind of like it at the same time, I don't have to brake coming to lights as i just coast in most of the time.