JeePJ

Hey i was wondering if it was worth getting the 4 cylinder over the 4L for better gas mileage and i ws wondering what the difference was in mpg?

adrian@justjeeps

Gas tends to be the same between the two

Jeepminded

I've never owned a TJ, from what I've been told don't walk away from a 4cl...run! The 4.0L in line 6 is no worse then the 4 and is like a anvil in terms of reliability. Better of with the 6 IMO.

gargyle

I have a 2003 Sahara in the I6, my buddy has the I4. Gas mileage is about the same, but I have way more power than his does. From what I've read in other articals the I6 engine was maxed out in the amount of power that could be gleaned from it and for most (if not all) versions you cannot get any more. Gas usage is the same, you cannot get it any better without making the vehicle lighter. So if you buy an I6 - try to keep it light (don't put on heavy aftermarket parts or steel wheels), keep it well tuned and don't waste money on "better breathing air filters" or throttle body spacers - they just don't work.

Sid1966

I have to disagree with part of this statement.The gas mileage part about getting it any better I agree with and the throttle body spacer I agree with,but the more power part i strongly disagree.On my 97 TJ i have installed a banks header,2.5 inch exhaust,no cat,cherrybomb glasspack,62 mm throttle body with a K&N filter and homemade cold air intake/snorkel.I dont have any numbers but the throttle responce and power output is amazing.Definetly worth the 2 mpg decrease in fuel mileage.For the best combination of performance and economy I agree with this entire statement.If this is your daily driver just keep it in good running order ie regular maintance,plugs wires,oil changes etc check out the power this Jeep 6 makes http://www.505performance.com/JP_magazine_DEC_2009.html

gargyle

Hey, if it's worked for you that's great. I don't have any experience with those kind of modifications, I've kept my Jeep stock (in the engine department anyway). I was just paraphrasing what I'd read on other forums. I'm spending my money on suspension and gears. Because it's my DD I do not want to risk any changes to the engines reliability (and I'm not saying there would be - I just don't want to risk it).

Sid1966

That was kinda what i was getting at ,If this is your DD then your probably better off leaving it stock, BUT if is a toy and you dont mind the fuel mileage penalty a lot more power can be had with some bolt on performance parts