I hope you've at least got the 8.25 or D44 in the rear.

 

D30 up front 8.25 in the back for me

 

The biggest things to improve fuel economy on an XJ:

- Don't drive like it's a race car or a Buick going to church
- Keep it in the power band ("Power" switch if you have one or don't shift when the stupid light comes on in the manuals)
- Lose weight (both you and your Jeep)
- Improve aerodynamics
- Keep up to date on all tuneup gear
- Keep engine clean
- Use reputable fuel with good detergents, though you may have luck with ethanol vs. non-ethanol (some people report different results)
- Tires at appropriate pressure
- Gear appropriately for transmission, tire, and weight combo (eg. deeper gears when towing will help)
- Calculate MPG properly

Everything else is just a bit of hacking that can take years to break even on. If you really want fuel economy drop in a diesel that will do 30 MPG.

Great idea, make sure to run one that can draw enough air such as the Taurus fan

Maybe if you have a carbeurated or TBI engine... does nothing on MPFI

These are best paired up. Engines are air pumps. Bored TB + actual CAI like a cowl "snorkel" + less restrictive filter, then do 2.5" pipe the whole way back with a high flow cat & muffler without stupid crush bends.

Helps only in ambient warm weather. In the winter the IAT reads "too close" to the real temperature and you burn a lot more fuel.

Nothing to do with fuel economy... Actually can cause problems as the engine will have a hard time maintaining operating temperature.

 

I find it ironic that your name is salad and you said lose weight. Thx for the good laugh! Lol. And a diesel would be sickkkkkkk.

 

Haha yeah. I'm reminded of the Mighty Car Mods episode where they bust the 'electric superchargers' being sold on eBay, and conclude that 1) You'd see more power gain if you just hit the toilet and dropped the kids off at the pool before going out, and 2) Leaf blowers were more effective

 

Is that those little fans that suposed to go in you intake or whatever?

First time I seen one of those on ebay I laughed for about 5 mins. "60hp gain" yea... sure. About as funny as the magnets on your fuel line to align all the electrons in the gas, makes is burn better. Lmao.

We need to band together and come up with one, make some dough.

 

Yup those are they! $1 per HP gain lol

You're right, we should. DIY Turbo kit, all you need is some pinwheels from your neighbors lawn and metal bowls from the camping store or mil surplus.