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bad mileage?

You might want to change your Fuel Filter if your still getting bad mileage, I didn't see that mentioned yet. I changed mine when I first got my Ex since I had no idea of the last time it was done.... picked up about 1-2 mpg easy.
 



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thanks! i totally spaced the fuel filter when looking through my list of things to do.
i will definitely go grab a new filter and put it in.

ps. anyone have any thoughts on the intake problem i mentioned last post?
 






I would put the stock one back on. It flows plenty well for a stock engine, it's cold air and it's the same filter used on the 460. Your tires/gears are killing you mileage more than anything, keep the revs around 2000, not 1500ish and you'll get better milage. The missoula elevation isn't helping you either, my truck is a turd over there.
 






why rev higher, doesnt that use more gas?

everyone agree 3.73 is the way to go, or is 4.10 better, especially since i plan to move up to 31 or 32's some day, and wanna keep the same gear set
 






I currently have 3.27 gears in mine. I've figured if I go to 31" tires 3.42 gears would get me close to the same ratio I currently have. I want overall like I have 3.73's, so I'm thinking 31" with 4.10 gears. It would be like haveing 3.82 gears with stock tires....

T-Bars has a great page for figuring all this in sig....or at least a link to a page to figure all this....
 






i will check that out, thanks.

oh back to mileage, anyone know about HHO? seems like it could work if everything is done right, but info would be great
 






why rev higher, doesnt that use more gas?

everyone agree 3.73 is the way to go, or is 4.10 better, especially since i plan to move up to 31 or 32's some day, and wanna keep the same gear set
There's a reason you don't cruise around at idle, there is no torque there. Same with 1500 RPMs, it's lugging and using more gas, keeping the engine near peak torque (2400 RPMs) will yield best mileage. I've tested it myself. I did a couple tanks cruisng around in 5th around 1500-1800RPMs and then used 4th which is about 1800-2200 RPMs and I could get nearly 2 MPG better by doing so, and that was with stock 235/75/15s.

3.73s are good for 30s but go 4.10s for 31/32s and 4.56 for 33s, ect.
 












You could probably pick up front and rear 3.73s axles for $400 or less and it's cheaper and easier than swapping the gears.
 












yes if you have never done them before.do you have 4x4?if so the front is going to be the really hard part.i would go 410 if you going to do all that work!ill be doing mine prob around nov and if you still want to go 3.73 ill sell you mine really cheap just to get ride of them
 






are gears really that hard?

No, lashing them can be though.... :) Not for the weak of heart, takes very special tools and if done incorrectly, you'll ruin your gears at the least, your whole diff and axles or more at the worst. I would suggest doing LOTS of research on how to do it correctly before trying, or the best idea is find someone who's done it and knows what they are doing help the first time..... But it's not HARD...just....tricky.
 






thanks for the info.
i have a kind of friend at an auto shop, so i might be able to get some help with it, or at least get a set put in cheap.

jd4242, how much would you sell the set of gears for?
 






ill sell them for cheap but we are talking like novberish maybe later
 












:thumbsup:
 






how often should the fuel filter be changed?

and is there any way to test o2 censors, i dont have a CEL, but they most likely have 150k on them, but i dont wanna spend $60 a piece for them if i dont need to.

thanks
 












I read a post on here that Ford dealers say the fuel filter should be changed every year now, mainly due they say to crappy gas. I don't know how true that may or may not be, I've only ever changed them when there was a problem, I've had a fair number of cars and changed like 2 in my lifetime (on EFI cars that is, their a snap to change on the older cars I collect so I do it whenever I mess with the carbs or lines on those) . So, I guess it's just whatever you feel is best for you.

No clue on testing the O2's. Sorry.
 



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