I'm not knocking anything. I'm stating that the XZT made zero milage improvements for me, and it claimed similar milage improvements as the MMM does. I asked Quad earlier on this thread on what was different between the XZT & MMM was and never got a reply. The money back guarentee has a 30 day stipulation. In 30 days it would be hard if not impossible to make an accurate determination. My conclusion is based on running the XZT for several months and comparing the milage to same time period 1 year earlier (w/o the XZT). Several months gives me 5000 miles fo compare which eliminates (at least minemizes) tank fill up error & eliminates seasonality error (everyone gets better mileage in the summer than the winter).

Your results may vary, and feel free to share your results as I am. I'm not trying to convince anyone & really don't care if you believe me or not. I'm simply sharing my experiance - NO INCREASE IN MILAGE W/ THE XZT.

 

Ok, I have run 5 tanks through with the MMM. So far so good, depending on my right foot, I am averaging 1.8 to 2.2 mpg increase with it installed. Seems to work pretty good at this point.

 

You know im sure some people have noticed a difference in fuel mileage but in a way im still skeptical that people are getting 2-3 MPG's more with it, what I think it is (along with what Mark Hodowanec said) that people are getting a FUEL MILEGAGE chip so well what do normal people do that would want to help out their mileage? They slow down or dont hammer on it as hard.

I have no doubt that these do work otherwise company after company wouldnt be putting them out but im still wondering TRUE readings this thread is like other MPG threads yeah I get 30+ MPG with my cummins or I can go 1000 miles on a tankful. I think people are exagerating you have heard from a few people stating no gain from it and those are the ones that probably did NOT change their driving habits once the chip was installed.

Now people stating a few more miles per tankful or ones stating like .75-1 MPG more I think are more acurate than ones stating crazy amounts.

Quad states an 8-12% increase well if on average you get about 15 MPG that means an increase of like 1.2-1.8 MPG's to be getting 2-3 MPG's going by their 8-12% you would have to be getting like 25 MPG's now and thats at the maximum of 12% as well.

I know obviously they could be stating a lesser amount and people COULD be getting better than they state but I think people are helping the amount themselves by taking a bit of the lead out of their shoe

Again I have no doubt it works and have NO issues with Quadzilla or their products (never even tried them yet...lol) I just think for the range that the chip works that you arent going to be getting a bunch more MPG's out of it.

I saw one person state that it helped their mileage while pulling their trailer, I would like to hear more of that cause then even if I got an additional .5 MPG it would pay itself off for me in like 3 months.

 

O.K. quad, am I missing something? Checked the updates section at your website and didn't see any new updates for the X2 or the MMM. Also still waiting on the update for the Commander to run all 5 levels for the X2 ! I know you know! LOL

Just a friendly reminder!

 

Ok, I`ve been waiting to post mileage until I was sure. Around town- no gain. I`m getting 16.3 so I can`t complain. On the open road 1 to 1.5 gain. 21.5. I can live with that. The problem with checking mpg with me is that I don`t always take the same roads or drive the same speed. All were hand calculated. Around town it makes a big difference in who you follow. It looks to me that I`ve gained back the mpg I lost when I put on the 295`s.

 

I have put 2 tanks of fuel through mine so far. I drive a very cosistant pattern every week to and from work. I have about 90% Freeway and 10% stop and go. I only post hand calculated mileage numbers and so far I have seen about 3 miles per gallon gain. This put me at 22.2 to 22.6MPG. I have not changed my driving style at all because I wanted an accurate measurement. I know 2 tanks isn't much and I will post again after several more tanks to see if the numbers stay the same. BTW, I very rarely drive more than 70 on the freeway and I do have a tonneau cover for what it's worth.

 

I think the m3 program feels better than the XZT for the daily commute, truck feels more responsive. valid point about the mindset associated with the programs, IMO as well. i probably killed any gain the software might be netting me as i pinned the throttle getting onto the freeway and such.

now to compliment the m3 i'm contemplating installing a momentary switch to lock the converter up in the seemingly endless instances where the commuter traffic plods along in the 40-49mph 'drone-zone' where she refuses to lock up...

the XZT script makes me nervous however, i want a pyrometer to tell me how things are going in there...

greg

 

Checked the Quad site tonight for the X2 XZT updates and the only one I still see is the factory 325 XZT 12/07/2007 date code update. Nothing for the MM 325 XZT MPG tune program yet.

I too am in that range that I think I'm not getting the full benefit of my X2 with the MM program as I can't hit the 1600-2200 range that often in stop and go. Looking forward to the new program. Maybe if people quit complaining to Quad and making him have to answer the same stuff over and over on the threads he could get the programs done and uploaded.

 

Mythbusters did a test and actually you get better fuel mileage withOUT a tonneau cover.

How it went best to worst......Remove tailgate put one of those nets on back (dont know why but it actually raised MPG's, Tailgate closed no top (a close second), tonneau cover, Tailgate off, (might be getting tailgate off and tonneau cover mixed up??) and last tailgate on and down.

So contarary to MANY beliefs (including my own) you actually get WORSE fuel milesage if all you do is lower your tailgate.

I was quite surprised with the results and they had reason for the stuff but I dont remember them exactly but its all in the design of pickup trucks.

 

It has to do with the design of the cab of the truck. Certain manufacturer's have designed the cab of the truck so as to create a stable air pocket inside the bed of the truck when at speed. The air pocket fills the bed of the truck and allows passing air to glide right over it, creating no drag. However, this only applies to SOME trucks. Mythbusters actually did a follow-up a couple of weeks later due to all the letters they got and stated that on the trucks they tested (which were designed to keep the stable air pocket in the bed) there was no mileage increase with a tonneau cover or tailgate-down. However there are some trucks that benefit from it. I know for a fact that the 2nd Gen Dodge's do not create an air pocket in the bed. I get better fuel mileage (though the increase is negligible) with my tailgate down on my '01 than I do with the tailgate up. My old Chevrolet S10, however, did create the air pocket. I haven't tested my '08 yet. It is really quite easy to test. Take a styrofoam cup and throw it in the bed of your truck then take a cruise down the highway. If the cup blows out, no air pocket. If the cup is still in the bed when you get done, air pocket.

And as far as a tonneau cover DECREASING fuel mileage, that is really kindof silly a notion. With regards to the bed of the truck, fuel mileage is affected almost exclusively by drag. If there is no stable air pocket in the bed and the tailgate is up, the tailgate creates drag and forces the truck to work harder to pull itself down the road at a given speed, plain and simple. Whether the truck was designed for a stable air pocket or not, a tonneau cover doesn't create any additional drag. It may not decrease the drag on some trucks, but it certainly does cause any additional. The only way that a tonneau cover would be the cause for a decrease in fuel economy would be due to it's weight, as some of the hard tonneau's are fairly heavy. Much like any increases in fuel economy due to the tailgate-up/tailgate-down/tailgate-removed/windgate options, the effects are usually negligible.

 

i'm checking the quad webite hourly, like a girl who keeps looking out the window to see if her date's shown up yet, afraid she's been stood up....

that and working, of course. diligently working.

 

well has your date arrived?????? hahaha sorry had to do it

 

Maybe a dumb question but, when the new program comes out for the mmm & I load it, what if I decide I liked the old program better? Can I just go back online & put the old back in? Also on my stock 06 should I put the boost fooling program in? What would be the advantage or disadvantage of boost fooling on a stock truck? thanks

 

I have kept a real accurate spread sheet of my hand calculated mileage and there was a noticable gain in mileage after I added the tonneau cover. On average it went up about 1 mpg.

 

The air flows over the cab and hits the tailgate, creating a higher pressure zone of air inside the bed. This high pressure zone facilitates smooth flow of air over it, but the air still circulates within the bed. So I'm not sure your cup test will be a reliable indicator of how efficiently the high pressure zone is working.

A tonneau cover eliminates the tailgate, thus preventing the high pressure zone from forming. Now, a low pressure zone is created directly behind the rear window. This low pressure zone creates drag because it applies force against the window of the truck opposite to the direction of travel.
It basically sucks the truck backwards a little.

I agree that the effects are generally negligible, but things like tailgate and tire pressure and speed and wind resistance and throttle position are cumulative and could add up to a big problem.