I'm trying to figure if any engine mods will give me any significant improvement in fuel economy for my jeep, and if so, what type.

I have a manual 2dr x and plan on putting 33s on it soon. I have to drive it on the highway a reasonable amount, so gas is a factor, but I wouldn't mind a little extra power when I need it either.

 

Short answer "no". Don't waste your money. If you want gas mileage buy a honda.

 

That's not exactly the answer I was hoping for, but it is exactly the answer I was expecting...

 

I'm driving a 2 door Sahara and getting about 19.8 mpg calculated (readout reports 21.5) with a decent amount of highway driving. I'm currently running 32's but have 33's on the way so cant give you a comparison yet. I have a CAI installed which did nothing really except squeal like a pig . I will probably install a Banks 2 door exhaust system when its available, but again it will do more for sound than fuel economy. Both may give you the feeling of a little more pep. I am running 3.21's not 4.10's at this time as well.

 

What do you really expect for mileage???? You can't get 25 mpg from a vehicle that is rated at 16-19 and those are under ideal situations. Everyday there is another mpg thread and for some reason people think they can get better than it is rated for.

 

I think your reading into it way too much. He just asked a simple question of if there is anything that can be done to improve gas mileage. He could have used the search but what fun would that have been? By the way I get better than the rated estimates.

 

We all know that the JK has aerodynamics just slightly better than those of a brick... but I've seen people on this forum CLAIM to get 1-2 mpg better than stock with the combination of a new exhaust and a CAI...

As for me, I have a CAI, and I believe (although there are too many variables to prove anything) that I gained about 1 mpg with that mod. I'm probably installing a new exhaust later this year, but haven't committed to it, because I'll probably smash the crap out of it on rocks if I install it before a lift...

 

A 2006 study found that the average American walks about 900 miles a year.
Another study found that Americans drink an average of 22 gallons of beer a year.
That means, on average, Americans get about 41 miles per gallon.
Not Bad.

dunno about the Jeep, havent dumped any in it yet.

 

Happy, does that account for the fuel we lose backfiring?

 

OK, back to basics. Engines are air pumps. The more air you can move in and out, the more efficient it becomes. Free up the air intake and exhaust routes, you may see some gains.

Reducing friction internally with synthetics may help as well, engine, tranny, xfer case, diffs, everything that moves and has lubricants.

Aerodynamics as mentioned above are out the window.

Reduce rolling resistance, keep the tires at the recommended pressure.

Alter your driving style, slow down and enjoy the drive in your new JK. Think of it as quality time. Let the guy in the civic buzz by and know that you could roll right over him if need be.

Your mileage may vary using any or all of the above mentioned suggestions.