Ok i dont get my mpg, it is not consistent with what others are getting and i dont have a lift or bigger tires yet.
Current mpg : 15.5 combined 70% gridlock driving with 30% freeway.
On the freeway i can get 24mpg
220 miles on a tank of gas.
Tires : 235 75 15 @ 32 psi
10w40 semi syn oil used

What ive done:
1. New walker cat
2. Flowmaster 44
3. Dodge stratus 4 hole injectors
4. Tranny complete flush out and gasket
5. New dizzy, wiring
6. New sparkplugs
7. Air filter - fram
8. New bosch 02 sensors from rock auto
9. New mopar iac
10. New mopar tps sensor

What needs to be done still
1. New battery, my current one is cheap and the voltage on the dash drops to 10v during driving
2. Motor mounts
3. Fuel pump with filter still factory??

I dont personaly think a CAI will do jack, maybe on of those cowl intake ones? snorkels make a difference?

Or am i getting the best mileage? Im curious about this because my xj gets less mileage than the wj 4.7????? Any ideas?

 

Oh coolant system parts done:
New water pump
T stat - is the 155 one. Freeway cruise is always 145/ 150. Gridlock it sits just below center.....too cold right?
New antifreeze
Radiator still original

 

You are getting great mileage... leave it alone

 

There's your problem. Put a 195* thermostat in.

 

You're getting good mileage for a 4.0 Jeep, especially if its got an automatic. Best I got when mine was stock with 235/75-15s was 21 mpg mostly highway, and I was happy about that. Getting about 18 highway now on 33's, and still happy with it.

 

Way too cold of a thermostat. Get a 195* tstat so the engine can reach the correct operating temperature

 

I check mine manually and average around the same... 15mpg or so... no matter how I drive it

my manual mj used to get 18mpg, big difference...

 

My XJ is getting 11 mpg with 3.55's and 33's. my milage took a hit when the manifold cracked since The o2 is getting a bad reading I'm dumping fuel. Once I get my header on I hope to get that 2-3 mpg back. Then more when I regear in the spring

 

I'm running a 3" lift and 235's with 50/50 hwy/city and I average 15.5 mpg. I don't have a heavy foot either. Looks like we're getting the normal mpg.

 

Ill change out the tstat with a 195f one and see if that makes a difference

 

You may not notice a huge difference, but running at 160* at highway speeds is not doing your engine any good.

 

i WISH i got that kind of mileage...

 

You STILL haven't replaced that? Come on man

 

Nope, I just don't have the time, and everytime I do get a chance to start something always pops up ! I'm trying to see if my buddy that has installed several headers on XJ's is free this week sometime if he is he said he will do it for $100 I'll take him up on his offer if hes free one night this week but He wont know how his work load is until tuesday

 

Its a cold day today....sat in peak hour traffic for 20 minutes temp sitting at 190....as soon as we got going temp dropped to 140...it could be stuck open? My heater got cold too ( nice and warm sitting in traffic)