I have a 2000 XJ with a 3" lift. My father says to only put Shell or Sunoco gas for it.

One trip to my fiance's parent's place, we burnt through the entire tank of gas getting there using Shell. This was on the highway route.

This weekend, we left our doorstep and the gas light came on. Without any option, we put in $20 in Mobile gas and amazingly, even on the rocky/hill road through the mountains, it made it all the way.

This makes no sense to me.

So what gas do you guys use and why?

 

I use whatever is convenient and cheapest. Different brands make no difference in anything I've ever had.

 

I prefer Shell or Chevron. I've had a noticeable extra 20 miles to the tank.

 

Ethanol kills mpg,so you guys should try to get non ethanol gas as much as possible.

I don't have any non ethanol stations near me so bp 91 or 93 shell v power

Premium fuels are generally higher quality,and totally worth the extra couple bucks per fillup.

It might be a placebo effect but I think the jeep runs smoother and burns less gas with the slower burning higher octane gas.

 

I use 90 ethanol-free gas from the local Valero. It's the only gas station around here that has it. It made a pretty noticeable difference in my Jeep and in my brothers ram 4.7. He went from about 16 mpg to 20ish.

 

4.0s aren't real picky about what you use for gas like a lot of newer cars can be. Ethanol free is ideal, especially for older motors. Otherwise it really doesn't matter.

 

Most of the fuel made in the US is all about the same. Most refineries batch fuel and the special adders are added when then load the tankers

 

I buy the cheapest. Haven't really noticed any difference when using the mid grade or the expensive one.

 

The owner's manual says to use regular, not high octane. The engine is designed and tuned for regular. 89 octane is what the I6 engine wants.

My 1999 2WD Cherokee Sport gets 19 mpg in mixed around-town driving, but gets just over 25 on long freeway drives - at 75 mph average open road speeds (CA 394) with periodic 25 mph crawls through the small towns. I have well-worn all-terrain tires all around and no aerodynamics (A/C doesn't work, so the windows are always open). I do avoid fast accelerations and hard braking, and use the cruise control.

Don't "top off" the tank - your Cherokee has a vapor re-circulator like most modern cars and you can ruin it and cost yourself $$ replacing.

 

So far, I have just used whatever is cheapest (usually from Wally-World (they are Murphy)). I have run their premium (93 octane) and their regular (89 octane) and can't really tell the difference with the E10 that they sell. There are two places here in town that sell ethanol free and I am going to run some of it on my next fill-up. With everything that I hear, THAT should help my mileage and be better for my XJ.

 

The ethanol free has some merit. I forgot to reset my clock when I filled up BUT after two 35 mile round trips pulling a 5x8 trailer of sod and a week of city driving I'm currently just under a half tank..

Other wise the cheapest 89 you can find.

 

Ethanol will wreak havoc over time on older motors that were never designed with it in mind. You won't notice any big performance gains but your motor will thank you for not using it in the long run.

 

its kinda funny people dont realize alot of the gas is from the same tanker ships or even the same railcar

 

There are a limited number of refiners in the US. Gas from the refineries are pretty much equal. The issue comes at the station level where contaminants and water can come into it. I get gas from any major station and tend to avoid mom and pop type places (yeah I know it's not a good idea to support corporations over small businesses).

 

X2 detergents also make a difference. Such is the advantage of fuels like these: http://www.toptiergas.com/retailers.html

My owners manual states quite clearly that use of up to 10% is acceptable and will not void the warranty. It does say that any use of METHANOL is verboten. This is commonly found in gas line antifreeze.