50/50 tyre change affect mpg? - Honda CRF1000L Africa Twin Forum
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post #1 of 7 (permalink) Old 07-06-2018, 06:06 PM Thread Starter
R.M
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50/50 tyre change affect mpg?

Well the stock tyres lasted 9000km & I replaced them with Mitas E07+ on rear & E10 on front. From a 100 mile spin I've noticed my lts/100km increase from 4.6L/100KM to 5.1/100KM (62MPG to 55MPG) also had the bike serviced at same time as tyre change.

Do these 50/50 type of tyres cause this?
Don't think my driving pattern has changed.

My long term L/100KM is 4.9 over 9000km.

Anyone notice same thing?

Last edited by R.M; 07-06-2018 at 06:06 PM. Reason: Mistake
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post #2 of 7 (permalink) Old 07-07-2018, 07:17 AM
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It would be normal to see a decrease in MPG with 50 50 tyres compared to the standard road tyres.

The E07's have a higher rolling resistance.

Once the edges of the blocks wear, you might see the MPG increase again slightly.
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post #3 of 7 (permalink) Old 07-08-2018, 08:02 PM
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The only gas mileage problem I have is my right wrist. If I can control that I get great mileage on any tire combo
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post #4 of 7 (permalink) Old 07-09-2018, 02:35 AM
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Originally Posted by R.M View Post
Well the stock tyres lasted 9000km & I replaced them with Mitas E07+ on rear & E10 on front. From a 100 mile spin I've noticed my lts/100km increase from 4.6L/100KM to 5.1/100KM (62MPG to 55MPG) also had the bike serviced at same time as tyre change.

Do these 50/50 type of tyres cause this?
Don't think my driving pattern has changed.

My long term L/100KM is 4.9 over 9000km.

Anyone notice same thing?
The question would be what circumference are the new tires compared to the old, depending on what tires I have on there is over 150mm difference in circumference between the same size tires.
A 150/70/18 rear stock tire v a Motoz Adventure rear.
You might actually be covering more distance than you were before.
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post #5 of 7 (permalink) Old 07-13-2018, 04:18 AM
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speedometer vs odometer

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what circumference are the new tires compared to the old, depending on what tires I have on there is over 150mm difference in circumference
Good point here.

I have wondered about the odometer and speedometer relationship.
All speedometers show higher speeds than actual - something about liability of the manufacturer in speeding issues I have been told.

But if the speed shown is say 10% more than actual, will not the odometer also show us that we have traveled 10% more than reality? That is quite a lot I think
This will again be affected when tyres are changed and rolling diameters are different.

As I think about this, I would imagine that there is also some slight bias creeping in if you do most of your riding at 100km/h vs 30-50km/h because of centrifical forces making the rolling circumference of your wheels longer again with speed.

Would love to hear other peoples thoughts on this...
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post #6 of 7 (permalink) Old 07-13-2018, 05:43 AM
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So when I sell my AT for a new one, I can say that it has between 5 - 10 % less mileage than showing on the ODO..
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post #7 of 7 (permalink) Old 07-17-2018, 10:49 AM
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....But if the speed shown is say 10% more than actual, will not the odometer also show us that we have traveled 10% more than reality?
One would assume, but it's not necessarily so. I know BMW's (or at least many) have optimistic speedometers with accurate odometers.

Regarding your mileage consider you went from a worn down tyre to a brand new one which should be a little larger circumference.
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