I think my mileage went up at somewhere between 6 & 11K with one of the scheduled maintenences, can't remember which. A lid, tire inflation on the high end, and cruise control all help. I've seen up to 19mpg on the highway with a 5.4, 4x4,3.55 LSD and 265 70 17 RTS's. Average around town mixed you're lookin at aroud 300-320 a tank
less if you keep your foot in it.

Aside from all this, we better start sayin f#ck the mud skippers and curly assed wachimicallits, and lay some pipe from Alaska and build a refinery or 6 , cuz this $1.6 somethin a gallon (and goin up for regular) is F@ckin' bull$#it!!!!!!! And i for one am sick of ****in' around with OPEC and that whole scene over there. Make it big mound of glass and let the French dig their own oil out from under it.

Sorry I gotta take a pill.....

WT.

 

My Screw is 03 5.4 265R70 and 17 inch tires. My gear ratio is 3.73.

At 70 MPH I am turning 1950 RPMs. If I had a 3.55 rear end I would be turning lower RPMs at the same speed right? (the driveline rotates 3.73 times vs 3.55 times for one revolution of the tire) So, you might get a little better mileage with the 3.55 gears. (4.83% difference between 3.55/3.73 gears)

On the other hand the engine would be working harder with the 3.55 ratio which in turn eats gas while you are accelerating. After that I must eat 4.83% more gas. So, lets multiply 15 MPG by 1.0483 = 15.72 or .72 MPG difference (big deal) with the 3.55 rear end.

Is my logic on track or am I out in left field here.

By the way I have 4500 miles on my truck. Most of my driving is mixed and I get about 13-14 in town (sometimes less) and that's while I am REEEAAAAL careful about slowly accelerating, slowing down way ahead of red lights so I can maintain some speed and not have to accelerate 6000 lbs when I don't have to.

On the highway I have gotten as high as 16.5 going downhill both ways with cruise control, going 60 MPH!!

Tom

 

I get 11 miles a gallon,with 5.4l 4x4, auto, 4inch lift, and 33's
and it sucks, but I hear we are taking over Iraq
Don't forget to align your monitor so it faces the little man east, be sure he does this 5 times a day>

I do wish that Gorge Dubya would learn the word is Nu-CLEE-ur
not Nu-q-lur (Read: NUCLEAR); especially if he intends to send my bro off to fight.

 

I have kept my mouth shut for sometime about this thread, cuz I thought some of these guys always drive down hill, didn't know how to divide, fudged their numbers, or maybe used the gas gauge and the odometer instead of measuring tank top to tank top and dividing the actual miles driven.

I just drove from Seattle to Vancouver Washington and tested my mileage. My truck now has 5800 Miles on it. I just switched to Mobil 1 Oil. I am not suffering from any delusions that that will help more than a tiny tiny bit, but for the money I thought it was a prudent thing to do.

Back to it . . .
I drove 60 MPH using cruise control all the way to Vancouver. The speed limit was 70 most of the way, but I really wanted to find out what my truck could do so I stayed at 60 MPH in the slow lane. I got 19.22 MPG! I was so pleased. That was only one test so I did the same thing again on the way back, but got cought two times (for short durations) in stop and go traffic on the freeway Friday night. The test on the way back gave me 18.22 MPG for an average of 18.72 MPG. That is good enough for me. I do hope for some small gain when the engine gets broken in more though.

This is a very flat run. I have a GPS and the altitude never gets up to 1000 feet above sea level. Altitude wanders up 300 feet and then back down and never any steep grades. Also, at 60 MPH I am turning 1700 RPM.

In town I only get about 14 MPG. This is when I am reeeaaal light on the throttle.

You can see my signature below for details on my truck.

 

WhiskyTango has a point. Maybe I shouldn't tell him the people who own the Alaska pipeline have a 10 year contract to sell all the oil to Japan. We don't get a quart! Helps the trade balance. Buy American and OUR oil back! Oil status FUBAR & SNAFU.

 

When I first got my truck I was averaging around 14 mpg on my 15 mile drive to and from work, then the mpg's went down and stayed around 12-12.5, recently I added a K&N fipk and true dual exhaust and even with a VERY HEAVY right foot my mileage was 13.7 on my first tank, hope that is a sign of things to come
Check out my gallery and here is a link to a video clip if youre interested in hearing how it sounds..... nice

exhaust clip

 

My screw averages 10.8MPG
Mixed hwy and town driving. Hwy = 120-125kph. Slow in town.
4x4, 3.55, 5.4L

 

I recently went over 19K Miles on my '02 SuperCrew and checked the gas mileage and it's gone from an average of 13 MPG to 15 MPG with mixed highway and city driving (I've averaged 3 tanks now). I switched to Mobile 1 on my second oil change and added a regular K&N on the second oil change as well.

Guess mine took a while to break in Can't wait to see what kind of mileage I get on my next long trip.

 

THall: I'm with you on this one. I normally drive "suburban conditions" to work and back (7-8 miles, 30 mph zones). I regularly get 12.75-13.5 mpg commuting.
I have only checked my trip economy on two highway runs. I went west to Aurora, WV (got on secondary highways in Cumberland) and returned with 18 mpg.
Two summers ago, I went with our church youth group to Maine. Going north on I-95, I watched my mpg increase from 17 & 18 in Jersey to 19 & 20.66 (my personal highest) in Connecticut, Massachusetts. This was an extremely flat trip, 67-72 mph, cruise on all the way (ideal conditions).
This is on a 2001, 4X2, 5.4L, 3.55 LSD with OEM General Grabber AW tires. Watch your tachometer when it shifts into OD, there's a huge drop in RPM compared to the other gears. It's all about gearing, keep the RPM below 2000 (for long stretches) and the economy "multiplies".

 

14.26 on this last tank and still pushing it a little

 

I have been testing the different gas types as Mike Troyer once suggested. I have found a big difference in the brands and performance. Several things come into play such as:

* I use a minimum of 5 full tanks of same fuel to get final results.

* Use same gas station each time.

* Same type / octane (obviously)

* You can reset the computer also. I did this with each different fuel to speed up the adjustment process.

*Try to maintain the same driving style with each tank. ( lol )

I said all that to say this. I have found the worst mileage came with Texaco Premium.(also tested Gulf,Citgo,Sunoco,Shell,BP,and the cheap sh*t gas such as Racetrac ) The best with Chevron Premium, which is my latest test. I gained .44 mpg around town after 6 tanks. I Traveled to Orlando last wkend and was hoping to check the hiway mpg. But I got to racing a few chevs and rams on the turnpike and blew the tests. Return trip was hard rain and only 45-55 mph so that wasn't a good test either.

Anyway, I can see/feel the difference with fuels. Small, but every little bit adds up. The area where you live dictates the gas formula and you will have to patiently do the tank after tank thing until you find the one that works for you.

My next test is an exhaust mod, but that's a different post,eh?

 

tHall,

I agree with your comments. The good news is that your gas mileage will go up after you break the engine in good, 10,000 - 15,000 miles. The bad news is the mileage will go down as your MAF gets dirty.

The 3.73 is a good match for the 265 FX4 wheels. The 3.55 would be a better match for the smaller 235 - 255 tires.

My gas mileage is below yours for two reasons. First, I don't spend much time on the freeway traveling long distances, and sceond, I like the left lane at 70 - 80 when I'm there.

Some day, on a long trip, I'm going to get patient and repeat your test.

 

flscrew,

interesting comments. I tend to stop at the same gas station most of the time, and seldom know the price of gas. I used to run premium once in a while when the price difference was close enough.

My dad sometimes would rhetorically ask: "Who would run anything but 87 octate in a truck. Since it was a rhetorical question I never answered. Now I have learned reading here that the computer is programmed to run 87 octate, so I just stick with the 87, and the next time he makes that statement I'll ask why?

There is a big difference in how the 5.4 runs on reformulated gas. If you borrowed my truck and filled the tank I bet I could tell if it was reformulated or not in a trip or two.

I also have heard that gas is formulated different for each season, and from experience the temp has a good 2 mpg difference from 70* to 10*.

 

It would be my preference to in the left lane at 70-75 too. It did take a lot of my patience to do that test. I hate being one of the slowest vehicles on the road. Were it not for the fact that it is still a new toy, me being as **** as I am, being alone on the trip, and had time to kill I might not have made it. There was real opportunity there though meaning a good flat road, alone, and plenty of time.

After I have 10k or 12k on my truck I'd like to check it again. I would also like to get a MicroTuner and and do the test that way.

This has been a good thread!!

Thanks to all that have participated.

Tom Hall

 

have read some good and some bad about them, so decided to try it myself. Will post if any mpg increase.