How many miles do you get from a full tank with your 4.0L?

I don't understand the significance of comparing miles to tank. I doubt you are all filling up with the same amount of fuel left in the tank. Which is notorious for having the light come on way early, and not linearly. If you're not using the amount of fuel put in to calculate miles per gallon, then it's pointless.

In Europe we use L/100km as a baseline, and it works well.
It depends on what you want to know, there is two ways to look at it, mpg will likely not equal your range and other way around, unless you take the same rout every day.
 
I don't understand the significance of comparing miles to tank. I doubt you are all filling up with the same amount of fuel left in the tank. Which is notorious for having the light come on way early, and not linearly. If you're not using the amount of fuel put in to calculate miles per gallon, then it's pointless.
True but I'm not looking for much more than a rough idea of range per tank for the 4.0L.
Other mitigating factors would be speedo accuracy which is often out so unless you use a GPS with a trip monitoring system it's not going to be totally accurate no matter what you do.
 
I recently regeard from 4.10 to 4.56 and changed out my old cadillac converter for a hi flow option, it was so loud I then changed the hi flow muffler to a standard one.

My per tank range dropped by almost 50K's, not sure if it's due to the lower ratios or the standard style muffler.
 
There are few of us here who had their Jeeps pushing 17-19 mpg range on 3.07, i was one of them.
Then, some mystery happened, and it dropped into typical 14 mpg range everyone else is in. I am yet to find the cause of it.
I have not tried any off-brands gasoline in the Jeep, for the reasons of having a bad experience with off-brands in previous vehicles. Cheaper unknown gas station have always given me cheaper performance. You think you will save yourself .15c on the gallon, but down the road when the needle is on E and you only driven half as far as you typically do with other gasoline, you realize that you just wasted $15 on air.

Best mod you can give yourself is a cruise control and go down in tire size. It is less about what you can do to it, and more about how you drive it and what you should stop doing to it.
Your numbers are a bit mystical, and consider the fact that you don't go below half a tank, i would double check the variables and math on them.
Did you change out your thermostat to a lower temp one?
 
I live in Albuquerque. It varies but I can get between 240-270, and there’s usually some highway driving mixed in. This is of course at the point when the light comes on, which means there’s still about 5 1/2 gallons left.

The furthest I’ve gone on one tank before filling up was from Flagstaff, AZ to home. After about 60 miles (and driving none too economically) it dawned on me I had my jerry can, and it had about 4 gallons in it. So, in order to see how far she could go, I stopped being so heavy on the gas where I had been.
I hadn’t run out of gas by the time I got home where my trip mileage read 337. She acted in no way that I might be getting dry.

After I got home I put almost all the gas from the jerry can into her. Unfortunately, I completely spaced and didn’t pay any attention to how much she took when I went to the gas station the next day. If I hadn’t been driving like a douche those first 60 miles, my mileage would have been even higher.
 
I live in Albuquerque. It varies but I can get between 240-270, and there’s usually some highway driving mixed in. This is of course at the point when the light comes on, which means there’s still about 5 1/2 gallons left.

The furthest I’ve gone on one tank before filling up was from Flagstaff, AZ to home. After about 60 miles (and driving none too economically) it dawned on me I had my jerry can, and it had about 4 gallons in it. So, in order to see how far she could go, I stopped being so heavy on the gas where I had been.
I hadn’t run out of gas by the time I got home where my trip mileage read 337. She acted in no way that I might be getting dry.

After I got home I put almost all the gas from the jerry can into her. Unfortunately, I completely spaced and didn’t pay any attention to how much she took when I went to the gas station the next day. If I hadn’t been driving like a douche those first 60 miles, my mileage would have been even higher.

200.gif