Got a 2000 with a 4.0 any suggestions on what I can do to get a boost in mpg

 

Buy a Prius

 

not rly a whole lot. leaving it stock is gonna be your best bet.

 

Okay but seriously, replace the upstream o2 sensor. Having fresh fluids and filters. Make sure tires have the correct pressure. Making sure you don't have a cracked exhaust manifold. Running Seafoam through the gas tank and intake. And if you're lifted with bigger tires, regear it. That's all I can think of off the top of my head.

 

youre going to get a lot of opinionated and dumb answers like this. a better intake will help, correct tire pressure, smaller tires, upgraded 4 hole injectors(depending on what year). and the way you drive is a leading cause of low mpg. slow starts and keeping the rmps below 2k on the highways will help.

 

Cherokee looks like half brick on top of whole brick, so good fuel economy is hard to expect.

 

now if prius came in four wheel drive there would be no wise cracks..

 

skinny stock height tires, wind breakers, seafoam, lose as much weight as possible
keep it clean and be an efficient driver

 

You tell him he'll get a lot of dumb answers and then tell him to keep his "rmps below 2k". Okay.

And these 4 hole injectors he is speaking of won't give you an mpg boost. 1 out of 10 people who upgrade their injectors see an increase in mpgs because their old injectors were dirty and gunked up. All you would need to do is run injector cleaner (like Seafoam, as i mentioned already) to see this theoretical mpg or two.

I will agree with you though, where you say that the way drive has a lot to do with mpgs. Slow and steady take offs rather than gunning it from a stop will give you a nice boost in mpgs

 

What Gears Can I run WIth 33x12.50 tires to get milage for hwy but still enough to play?

 

If you have an auto tranny = 4.56
If you have a manual tranny = 4.10

 

depends on transmission. generally 4.56

 

use non-ethenol gas.

 

thanks guy's I have an auto trans, it's a 2001 with 4.5 lift and the 33's, i was think 4:10's I was told 4:56's by some people i just scared they will be to low cause i have to take on the road trips on I-95

 

dont be afraid of higher RPM's. higher RPM for less gas is a good thing. but 4.56 should set you just above stock. which is perfect