wanted to know if I am about par for the course with mileage with what mods I have. I am getting about 13.5 around town per the DIC on 21 gallons. so here are my questions.

1. how far off will the DIC readings be off from my actaul mileage due to the 35/13.50/R20 that I am running, and how do you calculate what your actual mileage is.

2. Am I about right mileage wise with what mods I have shown in my sig.

3. I have heard guys talk about injector balance rates...what is that and how do you check them.

4. Per the owners manual it says my truck has a 26 gal tank, the most I have ever put in it was 21.5 and that was driving about 30 miles with the light on.

Any info will be greatly appreciated.

wanted to know if I am about par for the course with mileage with what mods I have. I am getting about 13.5 around town per the DIC on 21 gallons. so here are my questions.

1. how far off will the DIC readings be off from my actaul mileage due to the 35/13.50/R20 that I am running, and how do you calculate what your actual mileage is.

I don't trust the DIC MPG. It can be way off. Get a tuner that will calibrate your tire size. As for calculating actual MPG, I hand calculate miles/gallons. Either way, your tires and your lift are going to hurt your MPG.

2. Am I about right with what mods I have shown in my sig.

I guess so. Your mods are up to you. Have you thought about blocking your EGR and doing the PCV reroute?

3. I have heard guys talk about injector balance rates...what is that and how do you check them.

I'll let someone else take this question. But a dealer can do it.

4. Per the owners manual it says my truck has a 26 gal tank, the most I have ever put in it was 21.5 and that was driving about 30 miles with the light on.

Probably about right for your truck. Don't let it get to low though. I usually fill up at the 1/4 tank mark.

Any info will be greatly appreciated.

My responses are in RED

yea I do have the EGR blocked and unpluged, the diesel shop that does most of my work said the PCV reroute isn't worth it, so no i dont have that done. i have my programmers listed in sig and yes have then both set for the size tires I am running.

I say first use a GPS and see if it matches the speedometer. If not then that will throw things off. So when it comes to tuners and modules it can throw things out that cause the DIC not to read since other calibrations are off for the tune. So on the next long drive I reset the DIC and GPS miles and then compare at the next stop down the road like 4 hours. See if the mileage on the odometer is pretty close to the GPS. Then fill up and do a hand calc the the mileage. Before you leave fill to the top and do the same on the next fill to get close readings. Then you will know if it is correct or how far it is out.

Brian

one thing I forgot was when my speedometer shows 70mph, my edge shows about 78-79, so which is going to be more accurate, and the edge is configured for my 35/13.50/r20 tires

Is the Edge configured to know the tire?
Did you use the PPE to show correct speed?

I do not know PPE but if it will correct the speedometer then use that. Now the Edge should read off the ECM which will be corrected by the PPE. The Edge module system will not correct the speedometer. But you can from what i here correct the settings it shows based on tire size. If you set both up then return the Edge to stock value meaning reading the ECM and perform no calibration change. That is what it sounds like you did. So correct with PPE and leave the Edge with normal tire no change setting. The PPE has corrected the speedometer already.

Borrow someones GPS to find out what speed your going.

Brian

Take the height (diameter ) of your tire and multiply by pi (3.1416) to get the circumference, or the distance traveled per revolution. In your case, about 110".

Do the same thing for the stock tire, I assume 31", and your get 97.4". This means that your new tires are about 12.9% larger than stock. It follows that when your odometer says you traveled 13.5 miles on that gallon of fuel, you actually traveled 12.9% farther, or 15.24 MPG; feel better?

Now, when your speedometer thinks revolutions are such that you are traveling 70 mph, you are actually traveling 12.9% greater distance, or 79.03 mph. So the edge is pretty darn impressive!

thats what I was hoping for, and YES it amkes me feel much better about the mileage I am getting, here is a dinger though, which programmer is giving me the best, the Edge or the PPE, look at my sig and see that I have them stacked:)

Here is my thinking but it may be way off base. Ok since the Edge is a module system it alters the signals from the ECM and sensors to tell the engine what to actually do. But my thinking is that be based on stock ECM tune. Now you alter the stock ECM tune with the PPE and now when the Edge sees the info it trys to follows its procedure and the PPE is maybe trying to do other things. What i try is just run the PPE by itself and try the different levels. Run 4 or 5 tanks on each level filling the tank to the top and recording mileage and gallons used. Also note your driving like how much city and highway during each tank. Then try the next level and do the same. Then remove the PPE and back to stock and do the same with the Edge. Then the fun part. Both and trying different settings and noting it all.

From what I see from the post not one programmer works the same on the same truck setup. Meaning take exactly two identical trucks and run them side by side. One will get better mileage than the other. Throw on a programmer both on the same level and the better one may still get better mileage on that tune. Change the tune level and the worst running truck may be better mileage than the other. Just have to experiment.

Brian

Your PPE or Edge should be showing your balance rates +/-4 in park, idle and +/-6 in gear at idle. If they are out of this spec consider running some fuel additives. I run both 2 stroke oil (Spring/Summer/Fall) and power service or stanadyne(Winter).

I don't know how the programmers work stacked, I would wonder if one is fighting the other in regards to your speedo. Easiest thing to do is GPS your trcuk to determine actual speed.

thanks rebel7777, i checked my rates and are +/-5 at park and +/-7 in gear almost to the T what you said except at 5 & 7 not 4 & 6, one thing I did notice was injector 8 was one digit below it did show at 4 & 6, any thoughts, also i always run Lucas at every fillup. Let me know what you think.

I had an edge on my LLY(back in '05). My truck stalled on the 57fwy, and I had to get to the shoulder with no power steering, while rapidly decelerating. Doing some research on here at the time, I found others having the same problem. The LLY at the time had a problem with it going into limp mode from fuel pressure spikes, IIRC, and I (like a lot of others) shimmed up the spring, but also ditched the Edge. I ended up with the PPE, and never had any issues. Plus, the Edge and the others that don't re-calibrate your speedo, quite frankly SUCK IMO. It's 2009...They should be able to get with the program and do what the PPE's of the world do, and correct your damn speedo, instead of making you constantly look at their screen to see how fast you're going.
Just my $.02

thanks rebel7777, i checked my rates and are +/-5 at park and +/-7 in gear almost to the T what you said except at 5 & 7 not 4 & 6, one thing I did notice was injector 8 was one digit below it did show at 4 & 6, any thoughts, also i always run Lucas at every fillup. Let me know what you think.

Are they all showing that? WOW, I would start first with 2 stroke or some sort of additive and see if that brings your numbers back in place. I would have said on 1 or 2 do the ice pick trick, but if it is all of them you may need to change them all. That gets very expensive, so I would try other things first before I every make that decision.

I just noticed that you have 80HP injectors in your insignia, this probabaly the reason your rates are so high to each injector. Probably normal for those injectors, but I don't run them so I couldn't be sure.

they are all brand new, less than a year old

they are all brand new, less than a year old

Look at my bottom of my note to your question, the 80HP Injectors is what through me off.

yea sorry about that, I saw that after I posted, I was a little worried untill I saw that.