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Old 11-07-2013, 05:34 AM   #11 (permalink)
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Honda CBR250R FI Single - '11 Honda CBR250R
90 day: 105.14 mpg (US)

2001 Honda Insight stick - '01 Honda Insight manual
90 day: 60.68 mpg (US)

2009 Honda Fit auto - '09 Honda Fit Auto
90 day: 38.51 mpg (US)

PCX153 - '13 Honda PCX150
90 day: 104.48 mpg (US)

2015 Yamaha R3 - '15 Yamaha R3
90 day: 80.94 mpg (US)

Ninja650 - '19 Kawasaki Ninja 650
90 day: 72.57 mpg (US)
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Here is a rider that has tracked 2,700 miles since September with a lifetime of 120 mpgUS.
.
Grominator (Honda Grom) | Fuelly
.

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Old 11-07-2013, 07:12 AM   #12 (permalink)
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A high of 156 MPG??? Wow!!!

This motor is absolutely a candidate for a streamliner. I have around 500 miles on mine and everyone says they run better as they loosen up. Hopefully the mileage will increase as well.
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Old 11-07-2013, 08:14 AM   #13 (permalink)
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sr185 bullet - '81 Yamaha SR185 streamliner
Team Streamliner
90 day: 96.35 mpg (US)

Sunny Colarado - '06 Chevrolet Colarado WT
90 day: 24.18 mpg (US)

cbr250s - '12 Honda cbr250
90 day: 115.29 mpg (US)
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A good fairing should get this bike to do well over 70mph. My bike had a top speed around 65 before I started streamlining it. Now it's pushing 90 on the flat.
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Old 11-07-2013, 12:31 PM   #14 (permalink)
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Join Date: May 2011
Location: Syracuse, NY USA
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Honda CBR250R FI Single - '11 Honda CBR250R
90 day: 105.14 mpg (US)

2001 Honda Insight stick - '01 Honda Insight manual
90 day: 60.68 mpg (US)

2009 Honda Fit auto - '09 Honda Fit Auto
90 day: 38.51 mpg (US)

PCX153 - '13 Honda PCX150
90 day: 104.48 mpg (US)

2015 Yamaha R3 - '15 Yamaha R3
90 day: 80.94 mpg (US)

Ninja650 - '19 Kawasaki Ninja 650
90 day: 72.57 mpg (US)
Thanks: 326
Thanked 1,312 Times in 966 Posts
The only problems with mods on the Grom are the short wheel base and the 12 inch wheels. Air cooled engines are way more fuel efficient though. too bad we can't get any of the air cooled singles that are main stream in India. Great on gas and very cheap.
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CB Shine winner's choice
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Old 11-07-2013, 01:15 PM   #15 (permalink)
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Join Date: Feb 2010
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Posts: 303

sr185 bullet - '81 Yamaha SR185 streamliner
Team Streamliner
90 day: 96.35 mpg (US)

Sunny Colarado - '06 Chevrolet Colarado WT
90 day: 24.18 mpg (US)

cbr250s - '12 Honda cbr250
90 day: 115.29 mpg (US)
Thanks: 27
Thanked 71 Times in 46 Posts
Stretching the swingarm shouldn't be impossible, and it looks like it would fit perfectly into the Vetter Rifle fairing if you wanted to do something premade for about $1300. I don't see 12" wheels being that much problem since most large scooters ride on 13's, and Craig Vetter's streamliner has 10's.
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Old 11-07-2013, 03:06 PM   #16 (permalink)
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Join Date: May 2011
Location: Syracuse, NY USA
Posts: 2,935

Honda CBR250R FI Single - '11 Honda CBR250R
90 day: 105.14 mpg (US)

2001 Honda Insight stick - '01 Honda Insight manual
90 day: 60.68 mpg (US)

2009 Honda Fit auto - '09 Honda Fit Auto
90 day: 38.51 mpg (US)

PCX153 - '13 Honda PCX150
90 day: 104.48 mpg (US)

2015 Yamaha R3 - '15 Yamaha R3
90 day: 80.94 mpg (US)

Ninja650 - '19 Kawasaki Ninja 650
90 day: 72.57 mpg (US)
Thanks: 326
Thanked 1,312 Times in 966 Posts
Quote:
Originally Posted by sendler View Post
Here is a rider that has tracked 2,700 miles since September with a lifetime of 120 mpgUS.
.
Grominator (Honda Grom) | Fuelly
.
I wrote him to ask what the average speed was and he cruises around 40 mph most of the time. Up to but not above 50 mph. The one tank he spent at 55 mph he got just above 100 mpg. These numbers edge out the PCX150 but the gap is closer at higher speeds where I still get 95 mpgUS with much more storage space, weather protection, top speed cushion, and comfort. The PCX costs more though.
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Old 11-07-2013, 03:44 PM   #17 (permalink)
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CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
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90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

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Quote:
Originally Posted by sendler View Post
Air cooled engines are way more fuel efficient though.
What makes you say that?
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Old 11-07-2013, 03:53 PM   #18 (permalink)
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Quote:
Originally Posted by woodsrat View Post
For my taste it's too much like a street bike with lots of bodywork, high-tech dashboard, etc. and it's heavy for what it is (225 lbs. wet). I'd much prefer a dual-purpose version with molded color plastic.
So eventually you might like the looks of the Honda Pop 100 made in Brazil.
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Old 11-07-2013, 05:38 PM   #19 (permalink)
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Join Date: May 2011
Location: Syracuse, NY USA
Posts: 2,935

Honda CBR250R FI Single - '11 Honda CBR250R
90 day: 105.14 mpg (US)

2001 Honda Insight stick - '01 Honda Insight manual
90 day: 60.68 mpg (US)

2009 Honda Fit auto - '09 Honda Fit Auto
90 day: 38.51 mpg (US)

PCX153 - '13 Honda PCX150
90 day: 104.48 mpg (US)

2015 Yamaha R3 - '15 Yamaha R3
90 day: 80.94 mpg (US)

Ninja650 - '19 Kawasaki Ninja 650
90 day: 72.57 mpg (US)
Thanks: 326
Thanked 1,312 Times in 966 Posts
Quote:
Originally Posted by Daox View Post
What makes you say that?
Air cooled engines can run a much higher cylinder head temp which results in less thermal energy lost to waste heat.
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Old 08-06-2014, 05:10 PM   #20 (permalink)
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Grom's history...

Been awhile since I visited here and I figured I ought to bring you up to speed on my Grom.

Once the horrible winter weather went away I finally had time to do some back-to-back testing between my Grom and my '80 Passport with a Chinese 125 Lifan. It was a real surprise to find that the performance difference between the two (other than gas mileage) was really pretty close.

The Grom, despite it's small wheels, actually rode pretty nice for my 155 lb. weight. I'd added some preload adjusters to the front in an effort to stiffen them up a bit as they seemed to be set up for a hundred pound Asian rider. I found the shock, a throwaway, to perform adequately for my use.

The motor's electric feel was impressive. Very, very smooth for a thumper and it's F. I. performed flawlessly. Hit the button and ride!!

It's one-gallon tank was an irritation despite getting an average of around a hundred miles per gallon. If all that bodywork was a gas tank it would have been a lot better.

I ended up selling it because I just couldn't grasp how the F. I. system works or what I would have done if I'd had trouble with it. I'm pretty much a Luddite in this respect and despite carrying the shop manual around with me to study it all turned my brain to mush. The small tank and fragile plastics kind of soured me as well and given that the demand outstripped supply I felt it better to send it along to someone else who might appreciate it.

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