Yes they do. I think part of the reason they install those filters is to provide sca additive to the coolant over time to keep the ph level right.

 

I was told the truck got 16.2mpg on a tank of fuel!

 

Snow, if yours is a handshaker, than your nottoo far off from me. Think im around 17.5-18mpg. Seen 20 before but notsurehowthat happened. maybe downhill from vegas

 

This is an auto Tim. Being a 2wd regular cab I expect to see at least 17+ all the time out of this thing. In summer I want to see 19-20 every time the truck leaves the yard.

I'm gonna make it get it and its gonna like it.

 

You might be able to get there...but don't bet on it due to your heavy load in the long back. Also, you have tow mirrors (-0.5 mpg), big AT tires (-1 to -1.5 mpg), your lift (up to -2 mpg) etc. Have you recalibrated your speedo to the larger tires? I know 285's are about 4% farther distance, so that can screw up your calculation and your actual mileage may be 4% better...or approx +0.5 mpg.

 

Stock size tires? and I believe they are HT would have to look again. Lift?

I have pretty much all the motor maintenance and stuff to go threw yet before I can really see what we are going to be getting. I know the up pipes have leaks in them, I can't tell how bad, doesn't look to bad but I can only see a little bit around the pipes. Possibly boost leaks yet too, I also haven't checked that yet. Lots of things to get into yet.

 

Sorry for the late response but if the OP didn't get these answered:

A CA 7.3L with an automatic transmission did not come with a cat (some of the early ones of this generation might have gotten one in the 99-00 range). There should be an emissions sticker under the hood that says 'catalyst not required'.

My 285s put my speedo as close to dead on as I can get (according to my Garmin GPS). The 265s had my speedo a little high (by about 2-3mph at freeway speeds).

 

Trucks are supposed to have 265's stock? Sorry I have not looked at the door tag at all in this truck yet.

My excursion has 285's stock, I just thought the was what was on superduties 00-03.

I keep meaning to take the garmin along to check the speed because I question the tach. In my X 70mph is dead on 2000rpm maybe pushing 2050. In this truck for some reason 70mph reads 2200ish rpm's. I know when you start going over 2000rpms the mileage drops off quick.

 

They came stock with 245s or 265s depending on the package. Mine came with 265s.

 

My 02 X came with 265 stock and will probably go with 285 next time around.

 

I tried going with door-sticker-sized wheels, but Stinky would twerk when passing, so those came off the next day. They also made Stinky look like one of those Tootsie Pop women at Wal*Mart.

Important note: The air pressure on the door is for those skinny stock tires. When changing tire size, you need to refer to the manufacturer's inflation guide, not the door. I estimate our noses are between 4000 and 4500 pounds with a driver, passenger, and an empty bed - so properly airing the front tires need a little homework.

 

So are you saying to go by what's on the side of the tire for air pressure? I've heard different ways but not sure which is the right one to go by.

 

Our work trucks all get 80psi all around all the time.

I will for sure have to check the door tag and the actual tire size and then check the speed. That is a great starting point for the mileage, actually making sure the mileage is correct yah? lol

 

My truck's front end weighs 4400lbs (full tank, empty bed and nobody in the cab).

Toyo has a .pdf that explains more than you ever wanted to know about tires and load capabilities. There's an equation to extrapolate your tire's load capabilities at any pressure. There's also a chart towards the bottom that does most of that for you for just about any type and size of tire.

This is what I use when I'm not loaded or towing so I don't always have 80psi in the tires and wear down the center rib section of my tires prematurely (I only get 35-40K out of my mud tires if I take really good care of them):

http://toyotires.com/sites/default/f...-LT_102913.pdf

 

Like brian42 says, use the guide from your tire manufacturer - or use some of the tread-wear tricks found on the forum. I know from experience that going less than 65 psi in the front with my tires on Stinky is like driving on a cheese grater.

I feel reassured that my estimate was so close. There will be a significant difference between 2WD and 4WD, though.