why difference in mileage per tank on similar bike? - Page 3 - VTXOA
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post #21 of 103 (permalink) Old 01-16-2012, 01:17 PM
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Originally Posted by therealgeno View Post
If I were you, I would leave it alone if it is running like a champ. I usually avg about 130 before hitting reserve; sometimes more, sometimes less. But I am also pretty heavy on the throttle.

If it seems to you to be in great running order with no issues, then all I would do is see if you can put another 30,000 on it when it warms up...
Thanks. I can gat about 130 no wind. That guy has a great bike. I can even get 150 with all my reserve. All bikes are different I guess.

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post #22 of 103 (permalink) Old 01-16-2012, 01:54 PM
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People are saying that having a windscreen cuts down on mileage. Doesn't make sense to me. In terms of resistance, air moving over a smooth surface would seem to be a much better scenario than air hitting your torso. Probably depends more on the size and shape of the windscreen than whether or not you have one.

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post #23 of 103 (permalink) Old 01-16-2012, 04:05 PM
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It's a HUGE flat piece sticking STRAIGHT up, it isn't directing any wind, it is STOPPING the wind like a wall. It's called "Aerodynamics" and any engineer will tell you a windshield is a fuel mileage killer.

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post #24 of 103 (permalink) Old 01-16-2012, 04:38 PM
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Originally Posted by Chicago-Spike View Post
It's a HUGE flat piece sticking STRAIGHT up, it isn't directing any wind, it is STOPPING the wind like a wall. It's called "Aerodynamics" and any engineer will tell you a windshield is a fuel mileage killer.
I politely disagree with your interpretation of aerodynamics as it relates to this issue. Your torso is also acting as a "sail" with more restricted laminar airflow that that of a piece of smooth plastic. I also tend to have my body in a vertical position when riding and feel significant resistance when riding without a windscreen. Therefore, I agree that a windscreen does affect the resistance of your bike as does your body.

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post #25 of 103 (permalink) Old 01-16-2012, 05:12 PM
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In good old summer time I was running about 37mpg. around 150 before reserve. Its stock with a BIG windscreen, lowers and hard lowers on the guards. Now that we're in the winter I get about 95 before reserve.
That stinks! It better come back in the spring.
Oh its an 06 1300s.
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post #26 of 103 (permalink) Old 01-16-2012, 05:41 PM
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Huge difference...

Before my windshield I was hitting 145 to 150 cruising around town before reserve. Now that I got the windshield I hit reserve around 130 to 135 when I'm in town. HOWEVER....when I'm highway crusing I hit reserve around 165 which means I'm getting over 47 mpg on the highway. Which also means I can get about 212 miles to the tank!

I really think it's how you drive it also. I don't hit my throttle hard very often. I'm taking my bike to Colorado this summer. It's like 950 miles so I'm excited knowing I can do it in roughly 5 tanks. Only about $75 or so in gas and I'm in the mountains. Much better than the $200 it would take me if I drove my truck.

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post #27 of 103 (permalink) Old 01-16-2012, 06:26 PM
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Before my windshield I was hitting 145 to 150 cruising around town before reserve. Now that I got the windshield I hit reserve around 130 to 135 when I'm in town. HOWEVER....when I'm highway crusing I hit reserve around 165 which means I'm getting over 47 mpg on the highway. Which also means I can get about 212 miles to the tank!

I really think it's how you drive it also. I don't hit my throttle hard very often. I'm taking my bike to Colorado this summer. It's like 950 miles so I'm excited knowing I can do it in roughly 5 tanks. Only about $75 or so in gas and I'm in the mountains. Much better than the $200 it would take me if I drove my truck.
Im planing that trip as well, sure hope my milage comes back. maybe will meetup.
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post #28 of 103 (permalink) Old 01-16-2012, 07:51 PM
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I politely disagree with your interpretation of aerodynamics as it relates to this issue.
Your torso is also acting as a "sail" with more restricted laminar airflow that that of a piece of smooth plastic.
The body with arms forward is about as parachute as it gets.
Yet less restrictive per square inch than a windshield as Spike mentioned.

The Laminar flow so to speak on the body is broken up vs
a slightly curved windshield that's eye level with much more square inches of displaced air flow
and huge drag following it.

The resistance of windshield is not just what it's deflecting.
The drag it produced is why you get the diverted air flow coming in from the bottom and reversed air flow from behind
the body trying to equalize the huge negative pressure behind the shield.

Without windshield cruising long distance at 90,
it's normal to turn a bit sideways to the left with one on the throttle, left arm tucked behind.
Reduces drag by almost half, and less tiring.

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post #29 of 103 (permalink) Old 01-16-2012, 08:14 PM
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Originally Posted by Tonytiger1 View Post
Thanks. I can gat about 130 no wind. That guy has a great bike. I can even get 150 with all my reserve. All bikes are different I guess.
dont know what your tune is set at but might want to look into it. i ride aggressive always on turns and up and down hills. i get 160 to reserve. im getting 160 to reserve with a setup of 225 main 4 1/2 clip on the needle dj spring 60 slow and 1 3/4 a/f.




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post #30 of 103 (permalink) Old 01-16-2012, 08:14 PM
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Cool responsive....


I think I had a friend with pilot license (know it azz but a friend as well) tell me that for every time you double your speed you get 4 time the wind resistance...
so at 60mph you have 4 time more resistance than 30mph.....

Of course if he is wrong I would like to through it in his face...

Gray-haired bikers don't get that way from pure luck, if you got a $5 head? Get a $5 helmet.

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