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Old 02-17-2015, 12:35 PM   #11 (permalink)
It's all about Diesel
 
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250cc bikes seem to have the least compromise between overall performance and fuel-efficiency. Too bad in my country the import of used vehicles less than 30 years-old is not allowed...

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Old 02-18-2015, 01:34 PM   #12 (permalink)
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Metric - '94 Honda Magna 250
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90 day: 69.83 mpg (US)

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90 day: 35.97 mpg (US)

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90 day: 39.84 mpg (US)

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Quote:
Originally Posted by sendler View Post
What is the worst weather that you get in the winter? I have 6 feet of snow on the curb. And -10F/ -23C.
We don't get very severe winters now, we haven't had snow at my place for 20 years. It rarely drops below 0 degrees C.

I've gotten soft over the years.
Now, if it's wet or foggy, I take the car.
If I'm working Day Shift (too many idiot drivers), I take the car.
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Old 02-19-2015, 09:32 AM   #13 (permalink)
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My father-in-law used to tow the children around the field on their saucer behind his dirt bike. Good tires and protection from the wind is critical. We have ice racers and snowmobilers in western NY. My wife's family is from the area south of Buffalo.
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Old 02-28-2015, 04:03 AM   #14 (permalink)
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Join Date: Jan 2011
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Metric - '94 Honda Magna 250
Motorcycle
90 day: 69.83 mpg (US)

RedCelica - '94 Toyota Celica ZR
90 day: 35.97 mpg (US)

i30 - '12 Hyundai i30 Elite
90 day: 39.84 mpg (US)

i30-22 - '12 Hyundai i30 Elite
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Base Line

I've got three fills of "average" riding, not too fast, not too slow, some commuting, some weekend riding with my son, no serious hypermiling.

The average of these fills is 3.49 l/100 km (67.4 mpg), I'll use this as the base line to measure any mods against.

I've got the fairing mounted now and the new sprockets have arrived.
I'll probably play around with the height/angle of the fairing for a while before fitting the taller gearing, so I can see what works best without confusing the issue too much.

I haven't been riding as much as I'd hoped, we've had a very wet end to this Summer.
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Old 10-03-2015, 03:42 AM   #15 (permalink)
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Metric - '94 Honda Magna 250
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90 day: 69.83 mpg (US)

RedCelica - '94 Toyota Celica ZR
90 day: 35.97 mpg (US)

i30 - '12 Hyundai i30 Elite
90 day: 39.84 mpg (US)

i30-22 - '12 Hyundai i30 Elite
90 day: 39.22 mpg (US)
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It's time that I updated this thread.

I've given up the notion of using mpg figures to accurately compare adjustments or mods, there's just too much variation in riding conditions and minor fill errors with this little tank.

I started filling at my local service station and because they don't stock the 91 octane that I usually use, I filled with 95.
That gave me lower FE ???
Because previous experience tells me 95 should increase FE, I suspect their pumps are a bit off, so I've gone back to filling further down the mountains.

I fitted the larger front sprocket and saw an increase in FE. Fitting the smaller rear sprocket hasn't improved on that so far, but it's only been one fill, maybe I just need to get used to playing the gears a bit better.

I'm not happy with the screen I'm using, I'll probably make a custom screen rather than use another universal type, maybe not as big at this one though.

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Old 10-03-2015, 07:39 AM   #16 (permalink)
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Honda CBR250R FI Single - '11 Honda CBR250R
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Higher octane fuel has less energy content so will usually give lower FE.
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Old 10-04-2015, 01:34 AM   #17 (permalink)
It's all about Diesel
 
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Quote:
Originally Posted by D.O.G. View Post
This one seems to trap so much heat around the rider's legs. I'd rather leave heavy aero mods for scooters...
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Old 10-04-2015, 06:14 PM   #18 (permalink)
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90 day: 69.83 mpg (US)

RedCelica - '94 Toyota Celica ZR
90 day: 35.97 mpg (US)

i30 - '12 Hyundai i30 Elite
90 day: 39.84 mpg (US)

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Quote:
Originally Posted by cRiPpLe_rOoStEr View Post
This one seems to trap so much heat around the rider's legs. I'd rather leave heavy aero mods for scooters...
It's from this site どんなバイクにも*敵な屋*をお取 け-後つけバイク用ルーフ*ット「ルー シールド」150cc以上のバイク の装着例 さまざまなバイクに取り 付けOK
While most of their "roof shields" are for scooters, they also offer versions for road bikes and even trail bikes.

Despite being aimed at weather protection and not aerodynamics, some aspects of the shield have given me ideas.
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Old 10-08-2015, 04:24 PM   #19 (permalink)
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Streamlining an air cooled bike is a bit trickier than one with a radiator but quite possible with some thought. I use a coast down test to compare fairings. The hill is measured for height and distance. I average the speed of several runs after warming the tires. The best increases come from improving the flow behind the rider. See Sendler's tail box and some sailplane shapes.
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Old 11-20-2015, 08:30 PM   #20 (permalink)
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Join Date: Jan 2011
Location: New South Wales, Australia
Posts: 313

Metric - '94 Honda Magna 250
Motorcycle
90 day: 69.83 mpg (US)

RedCelica - '94 Toyota Celica ZR
90 day: 35.97 mpg (US)

i30 - '12 Hyundai i30 Elite
90 day: 39.84 mpg (US)

i30-22 - '12 Hyundai i30 Elite
90 day: 39.22 mpg (US)
Thanks: 23
Thanked 73 Times in 45 Posts
Thumbs up Gain

Here's an illustration of my current bike/car fuel savings.

We're having hot weather (40C+ one day) in my neck of the woods at present, so I've commuted by bike all this past week.

The rough difference between covering that 510km in the car (27.54 litres) verses the bike (16.58 litres) is $12.15 at today's fuel price.
That probably won't cover rego, insurance and minor maintenance, so for me there's no net gain financially by riding a bike to work.

The gain is in my mental wellbeing.

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