The fit holds 10.8 or 10.9 gallons so the time to empty should always be off.

 

a wise man once told me:

set tank size at 11gallons


I am within 1% on the mpg

 

SHM(super highway mode) on the FIT using the SGII:

These numbers were achieved at about 67F temperatures outside and the terrain or road was relatively flat. I was able to maintain this with a bit lower LOD, IGN and MPH which is expected. LOD seems to be easier to maintain than the IGN. IGN seems a bit fickle or rather I am not sure what really affects the IGN. I wanted to achieve the same LOD so I could demonstrate that the mpg of 55 is achievable at a certain LOD while the IGN and MPH can vary to some extent, also noting that maintaining anything constant is almost impossible depending upon ones terrain/road.

My last set of data was from using cruise control after achieving the SHM mode. The cruise control obviously keeps the MPH constant(for the most part) while the LOD and IGN varies more than in the SHM mode. I wanted to demonstrate here that the SHM should be higher than or yield better MPG than cruise control which it did although not by much. The cruise control set at 50mph(by the speedometer) yields what I have seen other FITs(of my model) yield, so it was a control as well.

Findings:

LOD: 46
IGN: 36
MPH: 47
MPG: 55.4


LOD: 46
IGN: 33
MPH: 49
MPG: 57.0


WHEN USING CRUICE CONTROL:

LOD: 49
IGN: 34
MPH: 48
MPG: 53.1

 

I have never seen 55 to 57 FE at 4xmph unless I had a tail wind.

Shawn, Most of the time the wind can play a huge roll in the test readings in addition to the draft from being in a pack of cars or not at all. Also road grade. even 1/4% grade is BIG. Not to rain on or discredit your results, but I'd be interested to see this with a test going in both directions on the same road with an keen eye on traffic and not using instant mpg reading. Doing it on the fly on the way to work is not too reliable IMHO

Also with the noisy nature of the instantaneous nature of the SG MPG to get decent results you need to use the SG trip, current, mpg and the reset button. I have current set up as a x-gauge on my junk. Just set up for the run, go to trip, current and use reset and it will start an avg of the test run. Try it and you'll see how it takes a nice avg. Take the readings as you have it shown then swap to trip to read avg FE for test using current

I tried to do SHM for a solid week and at the same speed never got close to 55mpg. In fact at any given speed held constant the LOD, IGN are 100% linked to the environment and rolling resistance. Temperature, winds, traffic and tire type and pressure are big variables.back off the gas and the LOD and MPH falls off, every single time if you did it from a steady state. When I'm less than 40mph then I just get 51mpg. 45mph is 48 on flat ground and some traffic and no wind 82F.

All that said, please make me out to be wrong and come back with some real testing data. I know mine can't do that, but if yours does maybe others can as well. I have always felt your '07 Fit was more capable by maybe 4 to 5mpg then my '08. But, you also know the +60mpg runs are very unique and only a few of us have managed to pull that results using a great deal of effort and patients.

set it to 10 or 11 (depending how far you like to take the tank before refuel) and leave it. I have mine at 11. It will not change the mpg you get unless you keep messing with it. The fill calibration if different and does not change the fuel tank capacity at all. The fill calibration makes a % change in the actual gas used compared to what SG read. Most are within 2% with 0% correction on the fuel side, unless you start using some advanced driving methods that include coasting with eng off leave it at 0%. I drive all out for FE and have a 13% correction to get her close to actual. One other comment, chasing the calibration on the fuel side based on fill up gals is a total wast unless you fill to the fill hole neck. A Fit's fill repeatability is very inconstant and greatly dependent on:

1. the slope of the drive way at the pump,
2. speed of fill,
3. pump auto shut off calibration ,
4. angle of the nozzle in the fill hole and the list goes on.

good luck

 

I calibrated it three times at the same pump since people said it is inaccurate some times after just one. Somewhere I read two was better, three was best.

 

So what do you have for % correction now and how do you drive?

 

Paul,

I agree with you. There are a lot of variables that will affect the results. I didn't think about the trip function. I will try that today though the temp maybe a few degrees cooler like lower 60's. Additional info, there was no traffic and I would have to say there was no wind affecting me(surrounded by trees on both sides) though weatherunderground states winds about 4mph or less at WN. I was driving into the WS(this would be against the wind, to some extent, correct?). Of course, you know I roll at a high psig. Also, the SGII could be off, which I won't know for sure until I fill up which maybe a couple of days. I gave up on finding SHM too at one point but decided to give it a shot for the hell of it the other day. I was really hopeing to see MPG in the 60+ range but only in the 55mpg area. I was able to repeat several times but not able to record it, need a 3rd hand. Oh, wait, I will try the camera I have here at work for video. Hopefully, the quality will be good and youtube will like it.

 

Shawn what do you have now for the SG fuel correction?

If it's stock or 0%, you can pretty much count on 13 to 14% optimistic data with the methods you use. You can take that to the bank. Next fill just roll that in and you can save yourself some pain geting to that point.

Also just wondering what is the size of the new tires?
Same as stock 195/55 R15 73.7" roll out

If they are different you will also need to tweak the SG distance as well.

Wind can be tricky when testing . Tress will cut it down compared to open fields but not make it go away. The on line weather was the avg at an airport and may be way different at your test area.

Anyway you got a cool take way with the trip, current, and reset. Have you set up any x gauges yet. they work but it's surprising how crude the set up is. Reminds me of writing code in machine language lol

 

SGII - I think the correction is at 12.6% and I haven't programmed any xgauges, I remember a little bit of FORTRAN programing.

Tire size = stock but the tread depth is 11/32 with a 23.6" OD and 880 rpm vs. 10/32 with 23.3" OD and 892 rpm = 1.01% difference. Now, that I think about it, my mpg from the stock tires should of been corrected due to less tread which would have yielded higher mpg readings.

Wind - website gave a graph of the wind speed vs time of day and a graph of wind direction at the time of day. So, I used the time of day and picked the corresponding values.

 

Not sure what the % is at now. I have snow tires on so it will be different. I live in the mountains but drive it like it needs driven. Accelerate nicely, foot off gas and drift to stop. When going up hills I maintain speed, which sometimes get the rpms going higher than I like. I will recalibrate it once I have my all seasons on again too. Speed on mine is within 1mph of what my tomtom says.

 

Well, this is my first attempt at recording SHM(youtube made it look worse!). You will notice that I start to fall off of 50mph at about 1min and after that I start a small incline on a bridge which is when I realize that I have gotten too far below 50mph. The road is bumpy and crappy which causes the camera to shake(my high psig doesn't help). There is definitely a lot going on with trying to hold the camera still, maintain speed, watch LOD and make sure I stay in my lane. I think what you can take away from this is that SHM does exist but it is hard to maintain for a while. LOD at 46 seems to be the magic number or at least it sticks out too me.

Paul, I didn't realize that reseting the trip would reset my "aFE" which is my average fuel efficieny for current trip. My SGII came preprogrammed.

I may attempt this tomorrow morning if I am feeling lucky. I tried like 8 times and this is the only video worth a crap:

http://www.youtube.com/watch?v=lFNwRBLCCV4

 

The point is to give yourself a little reserve. If you do rely on the Scanguage for filling up. The fuel light will go on long before the Fit uses up 10 gallons.

There is no point to set more than 10 gallons in the Scanguage. If you are not going fill up more than 10 gallons at the pump.

 

It will never be 100% accurate. After first few fill ups adjustments. It should be less than 0.5 gallon off every time you fill up (if you use the same pump). I had it for almost 2 years and I still needed to make minor adjustment every time I refueled.

 

I figured people would like to see some failed attempts on the way to work this morning as well:

Sort of failed:
http://www.youtube.com/watch?v=svIntwXFd3g

Failed because average was 50mpg:
http://www.youtube.com/watch?v=IcwriyJ7FKY


In all 3 cases(including previous post) it seems that the sweet zone is 45-47LOD. The IGN seems to fall into place when the LOD is achieved. You have obviously noticed that SHM is not as easy as it seems especially while trying to document it! Viewing the SGII through the camera LCD sucks! Oh, I was able to achieve 62.6mpg to work today

 

Update the SGII was optimistic by 1%, 1% too high that is.

I have since corrected for the mph and the gallons filled which has caused the SGII to read really low. This thing is touchy! I have tried to adjust the % correction up since it was in the negatives(-) and it is still low(mpg wise). So, now I am back to trying to calibrate this damn thing. I don't know why but I seem to drive worse when I get a lower reading than expected.

I have increased the mph reading by 1 = 1mph to read with the speedometer(however I wonder if that thing is accurate).

I have my correction at -1% now versus the -5.6& at fill up and it was 12.5% before fill up.

This morning I filled up again and didn't correct just pushed the done button and I will correct on the next fill up. I hope this does it. I should have never used it on the CRV.

 

I also increased my mph by 1. I used my GPS to calibrate the speed.

I just got my ScangaugeII for Christmas and have been playing with it all week. I've been wanting one of these since we got the Fit in June.

 

Shawn was ALL your P&G using the FAS switch?

 

Paul,

Yes, when I P&G I used the FAS switch.


However, lately Cruise Control has been my friend doing the speed limit.

I am confused about the SGII. I thought I had it nailed until I filled up this morning and I was 0.9% off. Look at the data and tell me what is going on:



My guess is the pump fill up precision or the fact that i increased the mph by 1. Since the numbers were off I corrected -0.2% so the correction factor now reads -9%.

 

Did you use the same pump? If not then the deviation is normal. It could even be considered normal if you use the same pump

 

You are correct to some extent but I guess I didn't ask the right questions. Take into consideration the SGII readings vs. the odometer readings. Lets take a closer look:

- My last 2 fills have not been adjusted( SGII has not been messed with)
- Notice the miles driven are off by 1.0% and -0.1%(SGII compared to the odemeter, that is) respectively.
- The 1/7/09 date has the mpg dead on but the mileage and gallons used are off.
- The 1/13/09 date has less variation in the mileage
- The 1/13/09 has increased variation in the gallons

I think we have concluded that the gallons used is subjective due to pump and fill errors but not the mileage. The SGII doesn't seem to be consistant with mileage therefore one will never get an accurate representation of the info, precise(referring to mpg) only by chance as my data shows(1/7/09). I am about ready to sell the damn thing Hell, I didn't need one before and now that I have it, it is irritating me more that helping me.