SCMT Mileage Test Today
Junior User
Joined: Mar 2004
Posts: 79
Likes: 1
From: West MI
First of all patriot thank you for your service. I spent 1 year over there way before it was cool to say you did. You will love your truck. Get your self a programmer of your choice and do a lot of reading here. I have a 2004 CC S/B 4x4 custome rims, and tires, diablo predator, mac intake. It Pulls like a freight train.
Senior User
Joined: Sep 2002
Posts: 231
Likes: 0
From: USA
I wish I got 22 mpg stock, mine doesn't even come close. I guess before I put my 315's and leveling kit I got better though. The lie o meter used to read about 18.6 at 75 mph on the highway, and in the high 16's around town. Now it reads in the 11's on the highway and 10.low in town. I need to get my speedo recalibrated for my tires and see what the lie-o says, since it was pretty close to my hand calculations before.
Posting Guru
Joined: Feb 2004
Posts: 1,584
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From: Lake Mary, FL
Originally Posted by Bigham
Thanks for the test. Oddly mine gets better milage in the HP setting then in economy. I mean 2.5 to 3 more mpg. In the summer I was getting 17.3 to 18 hwy/city in HP and did my own test in economy and got 15.4. I tested two tank fulls in economy when fuel was on the rise. Then I could not waste any more fuel. I also am very pleased with these numbers in HP mode.
Vic,
Do you think that if I got my truck reflashed that the mileage would increase? I have heard many stories of milage droping off from doing this but, with this new flash I have heard just good things with MPG increase?
Eddie
Vic,
Do you think that if I got my truck reflashed that the mileage would increase? I have heard many stories of milage droping off from doing this but, with this new flash I have heard just good things with MPG increase?
Eddie
Very often, if the performance setting is used in moderation, it may give you your best mileage.
It depends on how your drive, how you tow, and what kind of load you tow.
If your truck runs well and you are getting 18 MPG, I wouldn't try to fix what isn't broken =0)
Posting Guru
Joined: Feb 2004
Posts: 1,584
Likes: 0
From: Lake Mary, FL
Originally Posted by R1ZOOM
I wish I got 22 mpg stock, mine doesn't even come close. I guess before I put my 315's and leveling kit I got better though. The lie o meter used to read about 18.6 at 75 mph on the highway, and in the high 16's around town. Now it reads in the 11's on the highway and 10.low in town. I need to get my speedo recalibrated for my tires and see what the lie-o says, since it was pretty close to my hand calculations before.
Taller tires = greater load (engine load).
More engine load = more fuel.
If you get a lower axle ratio (numerically higher), you'll be under less engine load during acceleration and will usually get better mileage.
It doesn't make sense from an RPM standpoint, but believe me, it makes sense from a fuel consumption/load standpoint.
Load affects fuel mapping more than RPM.
It's better to be a couple hundred RPM higher, but be under less engine load.
You'll use less fuel.
So for you guys who have 36" or 38" tires and a stock gear.......upgrade that axle ratio to 4.56, 4.88 (or whatever)and get your mileage back!
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,246
Likes: 761
From: Houston, Texas
Originally Posted by t_j82
I definately wouldn't complain! The best mine does stock is 12 city, 13.3 combined and 15.5 @ 70 mph hwy. I miss my 7.3, maybe it had a little less power but at 2.30 a gal I'll take the mileage difference over a little power.
If you have very few, your truck is still being broken in and still needs time to develop. Better mileage comes with time and good break-in habits.
However, if you have alot of miles and thats what you're averaging, you may have a problem.
Elder User
Joined: Nov 2004
Posts: 550
Likes: 0
From: anchorage, alaska
Originally Posted by Dan Vac
First of all patriot thank you for your service. I spent 1 year over there way before it was cool to say you did. You will love your ...truck. Get your self a ...programmer of your choice and do a lot of reading here. I have a 2004 CC S/B 4x4 custome rims, and tires, diablo predator, mac intake. It Pulls like a freight train.
Elder User
Joined: May 2003
Posts: 833
Likes: 0
From: NW Montana
Originally Posted by Toreador_Diesel
How many miles do you have on your truck?
If you have very few, your truck is still being broken in and still needs time to develop. Better mileage comes with time and good break-in habits.
However, if you have alot of miles and thats what you're averaging, you may have a problem.
If you have very few, your truck is still being broken in and still needs time to develop. Better mileage comes with time and good break-in habits.
However, if you have alot of miles and thats what you're averaging, you may have a problem.
Mountain Pass
Joined: Aug 2003
Posts: 209
Likes: 4
I do not think thank that 80 miles would be far enough to get a good test for milage. Your looking at 4 gallons at 20 mpg. if your fillup was off by a quart it would make a 1.3 mpg error. From what I have read it also takes a few driving cycles for the computer to learn the new program to drive right. I would thank that you would need to program it, drive a few days, then check mpg on a longer trip. I believe that the numbers that you came up with are correct but unless you filled to the except same spot each time they are off, the shorter the distance the more they can be off.
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Posting Guru
Joined: Feb 2004
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From: Lake Mary, FL
Originally Posted by Aarkie
I do not think thank that 80 miles would be far enough to get a good test for milage. Your looking at 4 gallons at 20 mpg. if your fillup was off by a quart it would make a 1.3 mpg error. From what I have read it also takes a few driving cycles for the computer to learn the new program to drive right. I would thank that you would need to program it, drive a few days, then check mpg on a longer trip. I believe that the numbers that you came up with are correct but unless you filled to the except same spot each time they are off, the shorter the distance the more they can be off.
It takes a very **** method of testing (and some expensive equipment) to test with any accuracy.
For the end user, the only way to help eliminate SOME of the margin of error is to do the test over many miles and drive cycles.
It will still only be somewhat accurate, but you'll at least be able to see a pattern.
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