Exactly my point.

My dealer knew that I was in a "hurry" for my Fit. The truck rolled in with it about 9am on May 17th. I picked it up at 11am. They said that they did a "rush job" getting it ready for me. With all the other stuff that had to be done, including cleaning it up, they probably didn't do the ILP on it - and one of the Service Advisors even said so. HE suggested that I bring it in to have the ILP done on it - that it would take into account my driving style, set the air/fuel adjustment, idle adjustment, and several other factors which seem trivial but which could make a difference in the mileage that I'm getting.

I don't see how it could hurt, and I'll certainly report my findings back.

 

Claymore - your post brings up a good point with the mileage - could it be that certain driving styles are better "Matched" with the engine/transmission to train the ECU to be most efficient???

 

After hearing of all the people who had seen a nice increase in their mpg right after the idle learn procedure I decided to give it a try. I figured that it couldn't hurt to try, however, I've found that after my first tank (I filled up right after the procedure) of 90% highway driving I've only gotten 23 mpg compared to 28-20 mpg before. This procedure actually dropped my MPG! Maybe I shouldn;t have done it?
My question is, for those who did it and gotten improvements, was your first tank after doing it disappointing? I hope it does not get worst from here... A poster said that it could be that my compauter is re-learning, thus, causing the low mpg... hope he's right.. but it appears that others got better mpg immediately on their following fillup.
Any thoughts from those who has done the procedure??

 

Dude, give it some time, it has to relearn your driving patterns, air intake volume and temperature, throttle positions, etc etc.

It may take a while to settle in.

 

What if it were to get reset it and beat the car to hell? Wouldnt driving it normal give me the best mileage after its learned the new hard driving mode? It seems that all these people properly breaking in their Fits are getting the worse mileage.

Anyone else notice?

 

I was driving my usual way, which is fast launches, 10-15mph over the limit on the highways... and my average was 27mpg. Now that I'm doing a test and driving slower than molasses in winter (slow gentle launches, top highway speed at 60mph) I'm getting much better milage. I'm waiting to empty the tank before I draw a conclusion.

 

I've been averaging 28 mpg (AT Sport) and I've tried to avoid my fast launch habits to see if it improves. Seems impossible to do, though, because of the driver extremes we have in Florida -- the pace cars in the passing lane (despite a Florida law against hogging the left lane) and the rude SOBs who think "I-95" refers to the speed limit and weave in & out, cutting people off. Courtesy on the road is a thing of the past. I'm grateful for the Fit's quick acceleration that gets me off the ramp and onto the highway. "Yield" means nothing to people with monster trucks & SUVs. Everyone tends to bunch up in tailgating knots traveling at the exact same speed. That's when I'm willing to give up some fuel economy to accelerate and break out of the pack. I don't accelerate for fun -- I do it to save my life and keep my Fit intact! We took an informal poll at work (many of us have a long commute on crowded roads) -- the consensus is that Florida attracts the worst drivers from every state. Retirees get a lot of blame, but there is no broader demographic than the rude driver (which includes both the oblivious and the aggressive types). I'm pretty convinced that the Fit's mpg reflects my driving habits, but I developed those habits in the name of self-preservation! I'd like to drive slower and avoid jack-rabbit starts, but I think I'll have to move to a different state to be able to do it safely. Maybe a place where the climate sucks and no one wants to live there (?) I have over 10 K on the odometer, so by now my Fit's computer should have adjusted to me. I'd like to consistently get over 30 mpg, but don't have much hope at this point.

 

Thats why.... Once you go past 10k great mileage is sure to come.

 

I drove on I-95 in northeast Florida and it was the slowest highway driving I've ever done.

 

Did the ILP out of curiousity. Was averaging 29.6 mpg beating on the fit around town, with up to 8 mile trips on the highway....not too bad. After the ILP, got 34.2 mpg. First fill up, so may be coincidental, but Im very careful to stop after the first click and I always fill up at the same station. It may be a fluke, but will let you know as more tanks go by.

A/T Fit Sport, 4600 miles

 

Any updates on subsequent tanks?

 

I have filled up several times since. I have gotten varied mpg from 29-36mpg. I drive quite aggressively, so I am pretty happy with this, since it is about 70% city and slow and go highway. Still a kid at heart with close to redline shifts in 1st and 2nd. Noted that I get better accel now that the car is much more broken in (6000 miles now). I have stuck with the same gas, same gas station and even the same pump for full fills weekly. Not that I am ****, but its always available at the time that I fill up. I think that it gives good consistency.

 

I have 1,700 miles. Usually combined hwy/city and have yet to see anything better than 29 mpg. Does it get better later?

 

It improved alot after about 3k miles; and is still slowly getting higher.

 

Hmmm. I'll post my findings.

 

What should the idle speed be? Mine's about 900 rpms (the needle is a little bit below the 1). Is this normal?

 

UPDATE!

Car got the idle relearn done at the dealer and they did some other testing several weeks ago. ZERO change in fuel economy. The car has 6K mi. on it now, and I struggle to get 30 mpg with city/hwy combined! Ugh! Anyone else in this boat?

 

For goodness sake, LISTEN TO CLAYMORE!

Resetting the ecu will not affect anything if u dont have any current problems. The ecu learns of the conditions and driving style and adapts to it (ie. weather changes). These codes are called "Readiness" codes. If you reset your ecu and take it in for OBD2 inspection, you will fail.

If anything, it will result in slightly worse gas mpg b/c the maps have not been set. It takes about 50miles or so to get all the codes set.

 

I DO have a current problem...it's called atrocious gas mileage. What do YOU suggest be done/checked on the car?

 

CHECK YOUR DRIVING habits for one!

tire psi, switch to synthetic oil, bad gas, check all maintainence stuff. do you weigh 200+lbs?? all these contribute to your gas mileage. theres a gas mileage thread. READ IT!

plus, you should already know that Honda/Toyota and most major import companies were found to overexaggerate their gas mileage ratings. They are in the process of correcting all mileage numbers. You can expect to see the infamous Prius advertised mileage drop by at least 10mpg. Dont be suprised if you dont get your 30mpg.

If u're not throwing a check engine light (CEL), then nothing is wrong with the electronics of your engine, therefore, resetting ecu is only hurting gas even more.