Effect of fairings upon mpg? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 23 Old 03-01-2018, 04:54 AM Thread Starter
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Effect of fairings upon mpg?

I just completed my first tank on my salvaged 2014 Glee, and the trip computer is reporting 37.6 mpg. My buddy's 2012 (with fairings and a big windscreen) does 53 when I ride it in the exact same manner- cruising on the freeway at ~80 mph. This seems like too big of a gap to be put to just a lack of fairings and windscreen, but I could be wrong. Does it sound normal to anyone else? I have a windscreen on order, but somehow I doubt a windscreen will net me 16 mpg...

The valves have just been adjusted and the air filter is brand new and stock, stock pipe as well.

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post #2 of 23 Old 03-01-2018, 06:28 AM
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For a start, have you checked for any of the following:
1) Front / rear brakes binding
2) Riding with foot on rear brake
3) Wheel bearings tested for binding / drag
4) Fuel leak at throttle body
5) Riding style
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post #3 of 23 Old 03-01-2018, 07:15 AM
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and wind direction but 53 mpg seems high on a litre bike unless wind assisted so you might be going after unobtanium.


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post #4 of 23 Old 03-01-2018, 07:33 AM Thread Starter
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Quote:
Originally Posted by Gert View Post
For a start, have you checked for any of the following:
1) Front / rear brakes binding
2) Riding with foot on rear brake
3) Wheel bearings tested for binding / drag
4) Fuel leak at throttle body
5) Riding style
1. Front brake is riding a little bit, but not to any terribly noticeable degree, just light scraping when the wheel is free spinning. Rear is fine.
2. Nope
3. Front is good, haven't tested the rear but I will today.
4. Haven't checked that, but there is no obvious sign of leakage or smell of fuel.
5. That definitely plays a factor in overall MPG, but I got 53 on my buddy's 2012 650 pretty easily riding in the exact same manner. His has fairings and a large windscreen.

Quote:
Originally Posted by Macdoc View Post
and wind direction but 53 mpg seems high on a litre bike unless wind assisted so you might be going after unobtanium.
Not really sure on the wind direction, but there hasn't been much wind when I've been riding lately. Also, this is the 650 Glee strom I planned on ditching my K3 because of poor fuel mileage, but at this rate, I'm pretty pissed off at Stroms altogether...

"Definitely do not sit on a DL1000. Big mistake. You'll end up buying one. Happened to me. True story."
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post #5 of 23 Old 03-01-2018, 07:49 AM
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52 was my overall average on the 2012 650 when commuting on it. I don't remember getting under 40 mpg, even with cruise set at 78 mph/gps loaded down on trips.

Fill the tank up and then check the mileage manually. Do NOT depend on the mpg readout!
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post #6 of 23 Old 03-01-2018, 09:58 AM
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I average 46 mpg with my 2012 V1000. The lowest on my 1000 is what you're averaging on your 650. Can't tell you what, but you got something wrong.

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post #7 of 23 Old 03-01-2018, 10:13 AM
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What kind of tires between bikes? Air pressure? Chain lube?

2014 650 Strom
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post #8 of 23 Old 03-01-2018, 10:34 AM
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I second checking it manually. My 2013 DL650 has been reading lower fuel mileage all winter. 53 -> 47. I am attributing some to winter fuel and lower ambient temperatures, but recently noticed I could only get 4 gallons in after flashing fuel pump + 20 miles or so (210 miles) In the summer this would be 250 miles or so and a 4.6-4.8. Seems like mileage has stayed the same but mpg and fuel reading off in winter. Not sure if MPG calculations even use the fuel level sensor. Seems like the computer should know better than the fuel gauge how much fuel is being used. One other observation, I have not reset trip 2 in like 6000+ miles and yet the average on that seems way to easy to influence in just a tank or so. For example if I run 200 miles pretty hot the average will drop more than I would expect. Seems like the average is kind of a rolling average since reset not a total mileage since reset/total fuel consumed since reset.

Disclaimer - The are my off the cuff observations/impressions and not a result of precise logging of indications, fuel amounts and distances so they are subject to my all too human limits of perception. I am wondering if anyone else has noticed these things.

If you are really getting 37.6 something is not working correctly. Running cold maybe? Or thinks it is? 3 blocks on temp gauge on? You and your buddy should fill up and go for 200 mile ride and note the fuel blocks shutting off, then fill up. If you are really getting 37.6 you won't make it (or just barely 5.3G) I think of each block as 50 miles.

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Last edited by kfh000; 03-01-2018 at 10:37 AM.
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post #9 of 23 Old 03-01-2018, 10:51 AM
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Actually fairings can have a large effect on mpg. No fairing and you have a basically flat shape trying to pass through the air.
About the worst I get is 47 mpg with a spirited pace riding in the mountains.
Wanna know about high mpg and fairings?
Craig Vetter Fuel Economy Challenge. better mileage. Living better on less energy
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post #10 of 23 Old 03-01-2018, 12:41 PM
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Quote:
Originally Posted by aTuWitty View Post
I just completed my first tank on my salvaged 2014 Glee, and the trip computer is reporting 37.6 mpg. My buddy's 2012 (with fairings and a big windscreen) does 53 when I ride it in the exact same manner- cruising on the freeway at ~80 mph. This seems like too big of a gap to be put to just a lack of fairings and windscreen, but I could be wrong. Does it sound normal to anyone else? I have a windscreen on order, but somehow I doubt a windscreen will net me 16 mpg...

The valves have just been adjusted and the air filter is brand new and stock, stock pipe as well.

Are the front sprockets the same between the 2 bikes? The OEM 15 tooth reads about 8% high a 16 tooth will be pretty close.

From my experience >75ish is where the gas mileage takes a hit on the 650. If you are actually riding at 80 mph then yea <40mpg can happen. I've seen mid 30s in certain conditions i.e. 85mph, windy, hills, etc.

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