Its very possible that the engine was running very lean on the factory tune and correcting that caused it to burn more gas..

 

Yes, but unless the correction is rich, then at IDEAL afr's efficiency should be better than stock. I personally get 24mpg on mixed driving in SoCal. Depends how you drive of course. The stock ecu tune is terrible IMO. I feel like a monkey could tune for efficiency better.

 

Also depends on mileage and additional mods made after the tune. If it's been a while since the last tune, the car will need to be retuned for higher mileage conditions. I don't think I need to explain why you'd want a new tune after adding new mods, or in some cases after taking some mods off.

 

^very true. Even so it should still be better than no tune, but of course it is wise to tune after any mods that might change engine flow.

 

You do not need to retune for "higher mileage".. Unless the way the engine runs has physically changed-- ie you've added or subtracted mods-- then the tune will be fine

 

Yes, because a 150k+ motor that's probably been pushed hard works and drives exactly like one that was just broken in because engine wear does absolutely nothing to these motors...

You really think that tune is still going to be as efficient as it was 100k miles ago? On a motor that is notorious for it's OC issues?

 

Well, so far i am getting 21+ when i leave mine in eco mode. Before the tune i wasn't even hitting 20mpg.

 

Nothing in the tune will change over time. A properly maintained engine will run the same at 150K miles as it did at 50... and the little bit that it might change for wear will be compensated for by the ecu. The A/F targets etc that you want to be hitting will all be exactly the same so there is no reason to automatically mess with the tune.

Also being notorious for oil consumption means nothing if the engine isn't burning oil... but IF it did have the "notorious oil consumption problem" which affects far fewer cars than everyone on the forum seems to believe-- then it would be burning up to a quart a week and the owner would obviously know there was a major problem. At that point the tune would be the least of his worries.

 

Oh man ive been slacking, fogot about this thread, as Seymore said already the tune will not be effected by normal wear and tear, the ecu will still be set to try and meet its goals AFR wise now whether or not it actually does that is another issue all together. But the tune will remain the same now sure you could change the tune to try and make the car run a little better if you need some TLC but its really not going to be much of a difference that the ECU cant handle. But with an engine that has been taken care of should run exactly the same (unless you put 87 in it or something) until failure. I hope this post made sence writing this at work in a rush lol.

 

Bullsh*t. No motor with 150K will run exactly the same as it did when it had 50 miles or even 50K miles. Even a meticulously well maintained motor will still lose power over the years. The metals in your motor will still wear away even if you spend the money to use the best fluids, filters, and whatever else protection is available. You can take care of your motor to keep it running pretty well at 150K, but it will never run like new with those miles. The only way a car can have a motor that runs like new at 150K is with a rebuild or new motor altogether.

 

I don't see how a little wear and tear is going to effect the AFR of an engine.

 

150k is more than a little wear and tear in most cases. The compression changes over time unless maintenance is done to correct/prevent this. I use Seafoam myself. As well as sparkplug changes well before recommened.

 

I still have my doubts that the AFRs would change much if any. There are dyno charts of cars with low mileage putting down almost indenticle numbers as when theyre up to 80-100k which i mean that is a significant change in mileage if what your saying were true then we should see changes there. But the thing we have to remember is these cars are not just setup the ecu once and it will always do the same exact things you set your targets and from there the ecu is going to do its best to reach those targets now if its something drastic then of course at that time there will need a retune but i doubt it would be from just adding on mileage to your car. The only way to truely really know is to take a few dynos from low mileage cars and get an avg then take a few dynos from high mileage cars and get an avg and see what the difference is.

 

Or take the same car, drive the **** out of it, and redyno it at the same place, lol

 

Too many variables to get any kind of accuracy IMO