Average..........MPG

[JHarris1385]

P265/75-16.....31.6'' i think

They look like they could use a little more air but not much. How much psi is too much in those?

[etlsport]

The best way to figure out what pressure to run in your tires is to take a tire chalk and put a straight line across the tread. Drive a short distance and check the line. If it has wore off in the center of the tire then you have too much air. If it is wore off on the edges of the tread then you do not have enough pressure. The line should wear evenly across the entire surface of the tread.

quoted from a jeep tip guide for aftermarket tires

http://www.ajeepthing.com/tire-maintenance.html

[JHarris1385]

I dropped three mpg after the lift. But I knew that was coming but during the lift. I also got a diag on it that assured me it was a faulty MAF sensor promising me to bump back up to near normal mpg, and clear the Check Engine Light. But $140 (MAF) + $80 (diag) later I still have piss poor mpg and a CEL...

[etlsport]

id invest in a scan tool of some kind (id recommend scangauge II from tone) for 160 u get the ability to read your own codes and lots of other engine vitals

as for the mpg i dunno what to tell you.. sounds like its getting progressively worse? which would mean somethin clogged and getting more clogged.. fuel filter.. air filter.. egr.. for now id probably remove the roof rack and fairing and window deflectors if youve got them as they are just adding drag.. and sounds like until you figure the problem out u need as much aerodynamics as you can get

[ZEUS]

Is it maybe a leak somewhere? The fuel lines are under a lot of pressure being fuel injected so things might not leak unless it's running. ????? ????? Your tires also alter your speedo and odometer so you might be getting worse than 9 mph in actuality... not that you wanted to hear that... sorry! I hope you get it figured out soon.

[Y33TREKker]

Do you have any kind of aftermarket air-filter/intake setup? Maybe the power washing got the element wet and it's creating too much restriction?

Or maybe the power washing made an O2 sensor go bad (hot exhaust - cold water).

If you're sure the power washing is what started the problem, what would other components could have been affected/altered by a high pressure stream of water?

[JHarris1385]

where is the o2 sensor?

I am throwing a multiple random cylinder misfire code.

[Ldub]

Is it maybe a leak somewhere? Your tires also alter your speedo and odometer so you might be getting worse than 9 mph in actuality... not that you wanted to hear that... sorry! I hope you get it figured out soon.

Zeus,
Pardon me for sayin' so, but I've had a few fuel leak issues & if it was enough to decrease mileage, the olfactory sensor (nose ) would pick it up.

As for tires...larger tires rotate fewer times per mile, putting less numbers on the odo. ...for a point of reference, 33's are about 10% larger than stock.
When I figure mileage, I add 10% to whatever's on the trip & then divide by gallons...& it's still pretty dismal.

[ZEUS]

Zeus,
Pardon me for sayin' so, but I've had a few fuel leak issues & if it was enough to decrease mileage, the olfactory sensor (nose ) would pick it up.

Yeah, it could just be one of those "Jeep things you wouldn't understand"... you get so accustomed to huffing fumes on the trail with the top off; it always smells like it's leaking! Of course, maybe it always is!