I put a set of these plugs in the GS because I needed plugs and they were at Advanced Auto Parts. I was there they were 6 bucks a piece but I figured "what the heck, it's only 2 and I've got a 20 dollar off coupon if I spend 100 bucks". I've always been very skeptical of these magic fuel saving gizmos but these have me sold. Friday the wifie and I just took our sixth trip to Key West on the GS, a 280 mile round trip. The previous 5 trips the best fuel economy we got was 51MPG and that was on non ethanol gas. Returning today we gassed up at 231 miles just as the bike hit reserve, it took 4 gallons even. That's 57.75 MPG a 13% improvement. I did put a new DID X ring chain and stock sprocket set on a month ago and checked the valve adjustment on Wednesday (they were all fine) but I doubt that would add more than 1% if any at all. The bike also seems to pull just a bit better off the line  and sounds a bit throatier. If you've got the coin to pay 3 times the cost of platinum plugs they do work the way they say.

Don't want to rain on your parade, but average a couple more tankfulls and come back to us. 13% seems a lot from different plugs.

Good to hear man! I will look into them.

A little off topic, but I have a 93 GS500e and I don't know how I would know if I'm running out of gas... there is no meter.  Any suggestions?

Quote from: nhanxsolo on May 22, 2010, 10:06:50 PM
Good to hear man! I will look into them.

A little off topic, but I have a 93 GS500e and I don't know how I would know if I'm running out of gas... there is no meter.  Any suggestions?

I use the tripometer.  OP says he got 231 miles before he hit reserve, but it's different for every bike.  Last time I checked, I got about 45 mpg.  I run my bike on Prime nearly all the time and I just make sure to fill up before I hit 200 miles.

Quote from: nhanxsolo on May 22, 2010, 10:06:50 PM
Good to hear man! I will look into them.

A little off topic, but I have a 93 GS500e and I don't know how I would know if I'm running out of gas... there is no meter.  Any suggestions?

Fill up, reset your trip odometer to 0, ride until you have to switch the petcock to reserve, look at the number, subtract 15 from it and whatever your new number is, that's when you need to gas up.

Don't forget to put your petcock back!

Peace,
Syzygy

Why don't you tell us the plug letters and or number at Advance Auto Parts so we can just ask for it.

I usually just refill every 100 miles. That way I don't have to worry about forgetting to reset the trip odometer, every time the regular odometer rolls around to 100 I just put 2 gallons in it.

I didn't use the trip odometer I used a Medgellan GPS 2000 for this trip. My speedo is 8% high from either of the 2 gps units I have used on this bike (a Garmin GPS V also). I did check fuel economy with fuel actually used, not some arbitrary number pulled from when the bike goes onto reserve. I filled up with the bike on the center stand just before I got on the road and then when I refilled I did the same. Then checked the pump to see how much fuel was actually used and took the receipt just to make sure my numbers were right. This ain't my first rodeo into fuel economy, I keep a fairly good book on it. I just checked again and I was wrong with non ethanol fuel the best I got 2 up on this trip was 53.5 MPG but the worst I got was 48, which was the last trip 4 months ago. All checked on a GPS with fuel actually used.
This is suppose to be a site to share useful stuff. To me this was useful stuff, not a bunch of hooey. It would be tough to put these in a V8 to get maybe 2 MPG as a experiment but after this I will. Take it as you will. I'm not sure the number of the plugs, I was skeptical on whether they would work and not really that concerned with keeping track of that aspect of the job. The Advanced Auto here had a small motor cycle end cap, they were out on a shelf there with cross reference numbers on the package. I'm sure any Advanced can order them if they don't have them in stock.
Here's a link to their web for those who are interested.http://www.e3sparkplugs.com/

Thank you for the info.  In my experience, it takes more than one data point to indicate a true improvement.  For instance, I made a change in a process at work.  The reject rate before the change was 9%.  The 1st 24 hours after the change the reject rate was 0.1%.  After 3 weeks, the actual reject rate is 3-4%.  So the 1st 24 hours' improvement looked really good, but was comprised of other factors as well as my process change.

So it is a success, but not as good as I originally thought. 

Please keep us updated on subsequent data points! 

Quote from: Paulcet on May 23, 2010, 12:28:52 PM
Thank you for the info.  In my experience, it takes more than one data point to indicate a true improvement.

I completely agree.  I would avoid saying anything about the efficacy of new gas treatments/mods/spark plugs unless you have a number of data points (at least 10) before and after the change so that you can estimate the mean and standard deviation.  Then you could say with some confidence whether or not there was truly an effect (http://en.wikipedia.org/wiki/Hypothesis_testing).

And although you said that the previous 5 times you rode down you got a max of 51 mpg, a rise to 58 (without new spark plugs) wouldn't surprise me.  Heck, take a peek at my MPG trends:
http://www.fuelly.com/driver/discourteous/gs500f-2
Just two fill-ups I went from 44-58 mpg! A miracle, or my riding behavior was different and the low (or high) estimate was an outlier.

This is an aside that sadly will never come to pass (like the US adopting the metric system), but we should be measuring and comparing differences using Gallons Per Mile ESPECIALLY with a higher efficiency vehicle like a motorcycle:
http://www.sciencedaily.com/releases/2008/06/080619142118.htm
http://www.mpgillusion.com/2009/02/overveiw-of-gpm.html

Quote from: Syzygy on May 22, 2010, 11:37:37 PM

Quote from: nhanxsolo on May 22, 2010, 10:06:50 PM
Good to hear man! I will look into them.

A little off topic, but I have a 93 GS500e and I don't know how I would know if I'm running out of gas... there is no meter.  Any suggestions?

Fill up, reset your trip odometer to 0, ride until you have to switch the petcock to reserve, look at the number, subtract 15 from it and whatever your new number is, that's when you need to gas up.

Don't forget to put your petcock back!

Peace,
Syzygy

How do I switch my petcock over and back? lol. 

Lilwoody, any info like this you put up can be useful, as I said I wasn't trying to rain on your parade! And I'm not calling it 'hooey' or questioning the distance you travelled...our odometers are much more accurate than the speedos, although front tyre tread depth does affect it.
Where errors in measuring fuel consumption likely occur is in the accuracy of how full the tank is each time. That will be affected by a number of things. Certainly, I can 'fill' my GS, but if I want to get to an even dollar amount on the pump, I can squeeze an extra litre in quite easily. That would be enough to make a 10% variation in calculated  fuel economy on a typical fill. As others have noted, you need to average your results over at least 5 to 10 fills to get a consistent result.

You ain't raining on nothing there brother. I'm just stating the results that I have gotten on a product I was happily surprised that worked. I'm not trying to sell a darn thing to anybody, just passing on some info that some may find helpful to anyone who may feel like using it. I could give a flying rodents posteriori if some of the folks on here want to accept it or not. What I take exception to is being accused of not knowing what I am doing which I assure you all I do. If anyone wants to try them out I'm sure you'll be pleasantly surprised. If not, well I guess you won't have a learned opinion just conjecture and speculation as to the validity of the data. Then again seems thats what this site is coming to. Some one tries to post something useful of ask a legitimate question and before you know it their being roasted over the open coals of indignation.

I'd be interested to know if you've heard of Sonic Plugs http://www.enginebrain.com/ and/or tried them and what your thoughts are.

Michael

Woody, I've been very polite and nice to you in explaining why one fill can't give a definitive result, and now you're getting all cranky and defensive. OK, gloves off.
I predict that if you get similar economy figures for the next few tankfulls we'll be hearing all about it and if you don't this topic is going very quiet. No prizes for guessing where I'm putting my bets.

Quote from: nhanxsolo on May 23, 2010, 03:12:04 PM

Quote from: Syzygy on May 22, 2010, 11:37:37 PM

Quote from: nhanxsolo on May 22, 2010, 10:06:50 PM
Good to hear man! I will look into them.

A little off topic, but I have a 93 GS500e and I don't know how I would know if I'm running out of gas... there is no meter.  Any suggestions?

Fill up, reset your trip odometer to 0, ride until you have to switch the petcock to reserve, look at the number, subtract 15 from it and whatever your new number is, that's when you need to gas up.

Don't forget to put your petcock back!

Peace,
Syzygy

How do I switch my petcock over and back? lol. 

Hey you need to go take an MSF course or something, han ><

Peace,
Syzygy

Quote from: lilwoody on May 23, 2010, 09:48:13 PM
What I take exception to is being accused of not knowing what I am doing which I assure you all I do. If anyone wants to try them out I'm sure you'll be pleasantly surprised. If not, well I guess you won't have a learned opinion just conjecture and speculation as to the validity of the data. Then again seems thats what this site is coming to. Some one tries to post something useful of ask a legitimate question and before you know it their being roasted over the open coals of indignation.

It's healthy skepticism and was intended as constructive criticism of the "testing methodology".  I definitely did not mean to offend and am sorry if you felt like you were being attacked.  I certainly wasn't pissed at you and frankly I don't see any comments that would be construed as anyone being angry at you (per the "open coals of indignation" comment).  No one accused you of "not knowing what you are doing" but made suggestions for making a stronger claim about the efficacy of this treatment.  I personally have a burden of proof that hasn't been met to make claims whether or not these plugs really improve gas mileage.  I'm a big proponent of the scientific method, so I'll question any modifications that claim to significantly improve my gas mileage (because I want better MPG!!).  But please don't think that questioning your claims is disparaging them, I'm just looking for healthy discussion.