The CBR250R Gas Mileage Thread - Page 66 - Honda CBR250R Forum : Honda CBR 250 Forums
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post #651 of 689 Old 06-16-2015, 10:20 AM
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First two tanks with the new tail/ trunk are 95.8 mpgUS and 244.0 miles / 2.545 gallonsUS = 95.9 mpgUS, 2.45 L/100km, 40.8 km/L.
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The new tail didn't help much but at least it didn't hurt the fuel economy and now I can lock up all my stuff.
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Last edited by sendler; 06-16-2015 at 03:32 PM.
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post #652 of 689 Old 06-17-2015, 04:09 AM
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Quote:
Originally Posted by sendler View Post
First two tanks with the new tail/ trunk are 95.8 mpgUS and 244.0 miles / 2.545 gallonsUS = 95.9 mpgUS, 2.45 L/100km, 40.8 km/L.
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The new tail didn't help much but at least it didn't hurt the fuel economy and now I can lock up all my stuff.
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.

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with that kinda load 41km per litre is serious good number.. taller gearing ?

"A good long ride can clear your mind, restore your faith, and use up a lot of fuel."

RE Bullet 1977 - Current
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post #653 of 689 Old 06-17-2015, 06:03 AM
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taller gearing ?
15/ 36. Pulse N Glide. Following at 3 seconds. 65 mph On my way back and forth to work 40 miles each way.
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Added mass on a vehicle really only hurts the efficiency whenever you touch the brakes especially if you commute on an open highway using PnG. But I only got 78 mpgUS, 33 km/L ripping through pouring rain at 80 mph, 130 kph, on my way for that camping trip.
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I still have a few aero mods to add. Foam round overs for the leading edges of the tail, larger windscreen to shed the rain off of my visor now that I using a less radical tuck, removable lower panels to finish covering the chain and swing arm.
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post #654 of 689 Old 02-09-2016, 06:34 AM
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241.7 miles/ 2.696 gallonsUS = 89.7 mpgUS.
25F mornings with all the heated gear on. 35F for the evening commute. Cold temps really knock the fuel efficiency down.


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post #655 of 689 Old 02-09-2016, 09:39 AM
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Oh, yes, I can add something here, too.
Last year, it was for a 2200km trip an average from ~3.3 liter / 100 km
With 14/38 chainset
This year, with 14/36, it was from the ODO ~3.5l/100km on about 4.500km
But with a GPS checked and calculator corrected ODO , it is also ~3.3 l/100

Meaning:
Last year, the ODO was "spot on", this year, with 300R chainset, it is about 6% under the real distance.

But still 3.3 l/100kmh
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post #656 of 689 Old 05-22-2018, 07:15 AM
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4 valve adjustments up to 31,000 where I set them to the loose end of the spec. 51,000 miles on the bike now so time to do it again. You can check the clearance from the left side without taking the tank off but if changing shims is needed is better with it off. My first rear IRC tire went 15,000 miles. The second rear went 16,000. When I also changed the front front at 31,000 miles to the Michelin Street take offs from my R3. The third rear is done now after 20,000 miles. The front Mich feels choppy but has tread left so I will ride that a bit longer. I changed the gearing at 4,000 miles and the same sprokets are still on. The third chain I put on was a DID Gold at 31,000 and it is still good. And I ride in winter through salty roads. These small displacement motorcycles are very cheap to put miles on. This last tank was 242.7 miles/ 2.398 gallons US = 101.2 mpg. Previous tank was 104.9 mpgUS, 44.6km/ L, 2.24L/ 100km.


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post #657 of 689 Old 05-22-2018, 12:53 PM
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That's insane. I wish my chains and tires would live that long. I got 17,000km out of my IRCs and then the rear was technically a slick and illegal to ride. I usually get around 75mpg (3,1 L/100km) but I also don't tuck.

My computer is fighting Aids and Cancer in it's idle time, and yours?
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post #658 of 689 Old 05-22-2018, 01:21 PM
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I push my rear tires a bit farther than most people. To prove a point to the car people. My motorcycle uses less tires than my car. The front IRC still passed inspection for tread wear at 31,000 miles but I wanted to try the Michelins and they did give me another 7% fuel economy. I lubed and inspected my chain last night. No tight links, no adjustments needed. My bike has a streamlined trunk tail which also helps FE.


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post #659 of 689 Old 05-22-2018, 05:18 PM
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Garage
Usually 85-90mpg UK measures (70-75 US).
I don't deliberately ride for economy but rarely rev over 8000.
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post #660 of 689 Old 06-06-2018, 01:21 PM
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Quote:
Originally Posted by sendler View Post
I push my rear tires a bit farther than most people. To prove a point to the car people. My motorcycle uses less tires than my car. The front IRC still passed inspection for tread wear at 31,000 miles but I wanted to try the Michelins and they did give me another 7% fuel economy. I lubed and inspected my chain last night. No tight links, no adjustments needed. My bike has a streamlined trunk tail which also helps FE.
Were the tires you put on Michelin pilot streets? A 7% boost in fuel economy is awesome, sounds like I found my next tires! Do you feel that the bike rolls better during coasting? I'm running bridgestone S20 evos on my CBR 250R right now, just stuck a new one on the front to accompany the almost new rear. Previous searching for fuel efficient motorcycle tires showed only one option, the Bridgestone Battlax SC Ecopia, a tire for large scooters that is only sold in europe...
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