Sport touring vs dual sport tire fuel economy - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 18 Old 02-09-2017, 10:09 AM Thread Starter
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Sport touring vs dual sport tire fuel economy

I have been searching the forum trying to see if this has already been covered, but I can't find anything. Lots of threads on fuel economy but nothing specific to tires.
So here I am. I am curious if you have changed from a dual sport tire to a sport touring tire, has it affected your fuel economy? Also, what tire pressures have you run and what affect, if any, has it had on fuel economy?
I am asking because I have been averaging 33-34mpg with my K2, with Shinko 705 tires, no power commander and 16/43 gearing. I know the 16/43 has a negative affect on fuel economy and will be swapping the 17t front back in soon. I also have a 1620 Pelican case on the back, which may have a negative effect. My riding style is what I would describe as spirited, shifting around 5k rpm, but I maintain about 70-75mph on the highway in 70/30 highway/city driving. Bike runs fine but I will be swapping in a k&n and iridium plugs soon as well.
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post #2 of 18 Old 02-09-2017, 10:54 AM
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I doubt if you will see much difference with your fuel and tires. Air pressure will have some effect, but by far the biggest effect is wind resistance. Side cases, top box, those will definitely impact your fuel economy.
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post #3 of 18 Old 02-09-2017, 01:05 PM
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Don't be sure going up on the front sprocket will save you fuel.

I had the opposite happen to me on my Wee.

I dropped a tooth and my average fuel usage dropped too.

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post #4 of 18 Old 02-09-2017, 01:12 PM
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I'm a bit of a hypermiler, and I agree changing to 16/43 cost me mileage. Substantial mileage.
Roughly a 4mpg decrease on my k6
But unless the tire tread change is drastic, I don't see it causing much MPG change.

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post #5 of 18 Old 02-09-2017, 02:41 PM
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I think it is going to be up to you to tell us.
Try to do a relatively "controlled" mileage test before you make the change(s) and then try to repeat it afterwards.
If you wanted to get really anal - it would be 4 tests original / tires / sprocket / air filter. The only problem might be getting trolled for not having a life ;-)
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post #6 of 18 Old 02-09-2017, 04:17 PM
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If you record your mileage over many many tanks of fuel you will realize that your normal mileage changes a lot from from tank to tank. It's pretty much impossible to discern a mileage change of a few MPG. When someone says they see a 3 or 4 mpg change from changing a windshield or adding sidecases you will realize that they really don't have the information to support that. Speed (more precisely Airspeed)and temperatures (lower is worse) make the biggest overall difference I can see over about 400,000+ km 250,000 miles of Strom Riding.

I am sure that if there was a difference in the tires it would be no more than a few MPG if they had similar tire pressures and just about impossible to tell.

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post #7 of 18 Old 02-10-2017, 02:26 AM
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Tires wont effect mileage much. Bikes are so dirty aerodynamically speaking that wind direction would effect your mileage more from day to day. My '06 Vee gets about 39-42. I think you might need some adjusting. TB sync, Secondaries, something.
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post #8 of 18 Old 02-10-2017, 02:28 AM
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If you want to save on gas slow down. A motorcyclist has the aero of a large empty box.

Over 60 mph your economy will drop drastically. I can almost guarantee that shifting at 5-6,000rpm, avoiding full throttle and SLOWING to no more that 55mph will increase your mpg most noticeably.

If you don't want to ride like that fine - but that high speed motorway riding is killing your fuel economy. The different tyre should make no difference to fuel economy but as you spend 70% of your time at 70/75mph back to 17 gearing should have some affect..
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post #9 of 18 Old 02-10-2017, 07:55 AM Thread Starter
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Thanks for the replies and advice everyone. The consensus seems to be that changing tires either will not have an affect or will not have an appreciable affect. I had thought that lower rolling resistance might have an impact. As I only need a rear tire right now, I will probably just get another Shinko 705 and when the current set runs out will try sport tourers.
As NVDucati suggested, I will be performing several long term tests and will post my results on here. The first will be with plugs and filter, next will be with the sprocket change, followed by a smaller givi trunk and finally, eventually, different tires. I feel like I have a pretty good baseline as I check my mileage (corrected and verified using gps and law enforcement speed signs) vs fuel consumed and the results don't really seem to waver much more than 1mpg. This is probably also due to me riding the same commute all the time and not getting much varied weekend riding these days. ? As for Brockie's suggestion to slow down, the peril of riding at 55mph on a 70mph highway (where people regularly drive 80mph) in Florida is not worth the mileage gain. I am sure you are correct, as I have noticed an increase in mileage on weekend rides that are more backroads than interstates. I will also look into dialing in the throttle bodies and secondaries.
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post #10 of 18 Old 02-10-2017, 06:17 PM
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Changing from smoother-rolling tires to full knobbies on my KLR650 does have a noticeable but minor effect on power available at highway speeds (takes more throttle to maintain 80mph) and on mileage.

On the range of tires normally used on the DL, there's not much difference in rolling resistance.

It is common to notice a difference in rolling resistance between worn tires and new tires -- just pushing the bike around in the garage you can immediately tell a difference when you install new rubber. I suspect this plus a dose of the placebo effect might affect the anecdotal differences.
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