Improved MPG with steeper gears.

[FastGlass]

i get 17mpg on 37x13.5s in my rubicon manual trans on the highway. stop and go it drops to 15.5 ish

4.10's? That's crazy!

try checking your speedometer vs. your GPS to see if the procal did the correct speedo re-calibration.

The GPS doesn't typically lie on your actual speed, so the vehicle speedo should line up pretty close.

I did just this today. Cruise control at 40 showed 40 on the odometer. Just going to have to fill it up again and do the math.

 

[oscar the grouch]

Yep 4.10s I run it about 70.

Around town the key is to not lug the engine. If its below 1800 when you try and excellerate it will burn more fuel

 

[HAFICON]

Here is a screen shot of a great little MPG tracker I use. Just input each fill up, miles and total price it does everything. Currently running 315/70/17 Duratrac 34.4 new about 60% tread on them now and 4.88s Really wish I had done 4.56.



The big jump at 12/27/2014 was when I had a different exhaust on the JK but it was so loud I could not stand it. Pulled it off back to stock for now.

 

[oscar the grouch]

I am running the dynomax rockcrawler competition muffler


What app is that?

 

[Ranger Steve]

My v8 in my grand cherokee is a pig. I'd like to get 13-15 right now lol

 

[oscar the grouch]

same boat. My JK on 37s is the more fuel efficient rig.

 

[HAFICON]

I am running the dynomax rockcrawler competition muffler


What app is that?

Think that is the exhaust I had,

Mileage app is "Mileage Keeper"

 

[rubicon91]

Think that is the exhaust I had,

Mileage app is "Mileage Keeper"

Now I am downloading this app. Going to check it out

 

[oscar the grouch]

must be an iphone app. ill find one on play that works

 

[rubicon91]

must be an iphone app. ill find one on play that works

It was in the app store for my Iphone so I would have to say yes. Did I hear Oscar that you are going to Jeep Beach on the SEES side of forum? If so I will see you there and maybe buy a fellow expo portal member a beer:sombrero:

 

[oscar the grouch]

I will be there. I'm friends with a ton of vendors from when I spear headed JeepsonTrails. We rented a house on the water this year. You'll have to.come grill with us for lunch one day

 

[rubicon91]

I will be there. I'm friends with a ton of vendors from when I spear headed JeepsonTrails. We rented a house on the water this year. You'll have to.come grill with us for lunch one day

Well you don't have to tell me 2x lol. I went last year and loved it. Anytime you can mix jeeps and beaches I will always have fun. I have not decided if we are going to do tues-sunday or just Friday on but I will reach out and say hey.

 

[oscar the grouch]

Sounds good. I drink good beers so the cooler will be full of ipa ales and the ninja will be mixing drinks all week

 

[Dan Grec]

FWD does not improve mileage.

Actually, it does.

Due to the rear diff in a RWD vehicle having to re-direct the power at 90 degrees, a RWD car will always have more drivetrain loss than an FWD car that doesn't have that 90 deg "bend" in the power.
Physics says there is nothing you can do about it. "90 degree" diffs are just inefficient.

Typical FWD cars lose about 15-18% power to the drivetrain.
Typical RWD cars lose about 22-25% power to the drivetrain.

-Dan

 

[SoCal Tom]

Actually, it does.

Due to the rear diff in a RWD vehicle having to re-direct the power at 90 degrees, a RWD car will always have more drivetrain loss than an FWD car that doesn't have that 90 deg "bend" in the power.
Physics says there is nothing you can do about it. "90 degree" diffs are just inefficient.

Typical FWD cars lose about 15-18% power to the drivetrain.
Typical RWD cars lose about 22-25% power to the drivetrain.

-Dan

That's assuming the engine is mounted that way. My example still has the 90 degree change. Also There are RWD cars with transverse mounted engines that would get the same benefit.
Tom