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Old 03-15-2008, 05:05 PM   #11 (permalink)
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Quote:
70% freeway @ 75-80 mph
Ah, well there's your answer.

Bikes have horrid aerodynamic properties, so there's no escaping bad fuel economy at high speeds.

I'd try to find a route that will let you ride at a more relaxed pace.

Or re-gear the thing to reduce engine RPM.

Or visit craigvetter.com and get inspired

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Old 03-15-2008, 07:08 PM   #12 (permalink)
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Ok, my turn! (all photos are of the actual bike I road)


My first motorcycle, a 1967 Honda CL160, paid $100 for it with a seized engine, few weeks later had it on the road, used it for about 4 years, I always got above 70mpg, often 72-74mpg, never up to 80, altho I didn't try, had plenty of power for in town, and to take passengers, but it wouldn't go much over 65mph (Wisconsin's highest speed limit)

Next!



1975 Yamaha RD350, poor gas mileage! 42-54mpg, had to fill it up every 120-150 miles or risk hitting reserve, the shop manual claimed that at 35mph it would get 75mpg with a 140lb rider, but the engine wanted to go faster all the time.



After burning up the engine on my RD350... twice, I borrowed a 1980 Honda CM400 (night hawk?) it was sluggish, and heavy, but ran really smooth, never managed to get up to 50mpg with it before returning it, was expecting more for a 4 stroke.



I then got a 1972 Honda CB100... or part of one, no title, no gas tank, bent valve, didn't shift correctly, by the time I sold it a few years later it was fully leagel, and ran perfectly, getting no less then 65mpg, and in to the low 70's, partly because I road it with the throttle wide open (60mph top speed), I sold it, when I got my CB125 and also kept a '71 CL100 (scrambler) that is restored aside from needing carb work.



Current ride is a CB125, still ride it with wide open throttle alot, always gets about 65mpg as well, and comes close to 70mpg at times, top speed closer to 65mph if I tuck in.
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Old 03-15-2008, 07:26 PM   #13 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
Or re-gear the thing to reduce engine RPM.
I was surprised because my VFR800 (1999) got about 45MPG and I drove the same way. I have gotten 36MPG on the last 3 tanks I've filled. On this next tank I'm going to try to remove all the luggage that I'm towing as it creates a larger aerodynamic drag on the bike. Additionally, I've read that gearing down does help things quite a bit. Unfortunately the bike is geared so tall in 1st gear, I think it would hamper my urban riding.

Funny thing is that my motorcycle's engine is larger than my Insight's !
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Old 03-15-2008, 07:51 PM   #14 (permalink)
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Quote:
Originally Posted by Ryland View Post
Ok, my turn!
Nice fleet!
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Old 03-15-2008, 07:54 PM   #15 (permalink)
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Quote:
Originally Posted by donoman View Post
On this next tank I'm going to try to remove all the luggage that I'm towing as it creates a larger aerodynamic drag on the bike.
I'm betting you notice a difference at the pump by doing that.

Quote:
Funny thing is that my motorcycle's engine is larger than my Insight's !
That is funny. My buddy has an SV1000 - likes to remind me his motor is the same size as my car's, and about twice as powerful.
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Old 03-24-2008, 01:21 PM   #16 (permalink)
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I just sold a 89cc Jialing Passport that averaged 100mpg around town. Pretty much full throttle all the time unless cruising at 35mph or so. If I rode it every day mileage would improve to 105mpg for some reason. I average about 50mpg with my DR650 and I'm hoping my soon to be finish CB125 will get somewhere around 75mpg if I use it around town only.
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Old 03-25-2008, 10:52 PM   #17 (permalink)
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Sweet rides guys!

To think my cycle only gets 321 eMPG....

Would be nice to have something with better range on it though.

Anybody ever hear of a biodiesel or veggie oil cycle conversion? Bet that would get some good mileage!

EDIT:
Found one! Gets 200 MPG.
http://www.realclassic.co.uk/diesel05112800.html
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Last edited by bennelson; 03-25-2008 at 11:01 PM..
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Old 03-26-2008, 07:29 PM   #18 (permalink)
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I seem to recall my naked gs1000 getting 54mpg (us) on the hiway.

So 74mpg is the number to beat so far, too easy (just kidding, looks to be something of a wall at 70mpg ish for bikes that can use the hiway) I just filled up the 250 this morning and have to approximate (switched tanks), but it is looking like 62mpg with learning how to ride again, and the stock sprocket.
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Old 03-26-2008, 08:36 PM   #19 (permalink)
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That diesel cycle really looks like it has possibilities.

Long range, highway speed, AND good fuel economy!

Why is it though that gas cycles can't seem to get past about 70 mpg? Is it just the terrible aerodynamics? Everything else is better; lighter weight, simpler design, etc.

I suppose part of it is that cycles tend to be targeted to the "more speed and power" crowd.

The 50cc scooters are marketed to the economy-conscious. They can get 100 mpg, but I guess they get less wind drag when they are only going 35 mph.
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Old 03-26-2008, 08:46 PM   #20 (permalink)
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I borrowed my friend's 82 honda 450 nighthawk for a ride, and averaged about 45mph for a couple hours, most of the time in top gear and got 67 mpg. this bike has an overdrive 6th gear which is nice for fe, though i think the aerodynamics keep you in this range unless you drive slower than 40.

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