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| 2000rpm@100km/h vs 2000rpm@110km/h ???? http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=34017 |
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| Author: | ObiHann [ Thu Jul 10, 2008 9:44 am ] |
| Post subject: | 2000rpm@100km/h vs 2000rpm@110km/h ???? |
So here is my question, when am on the highway, my engine is at 2000rpm wether I travel at 100, or 110, and often even 120 only pushes me to about 2100rpm. Are there any "other" factor's that come into play, or am I using just as much gas at 120, as I am at 100? A friend with a accord is claiming he burns less gas at 110 than at 90, but how does that make sense? |
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| Author: | jeepkj02 [ Thu Jul 10, 2008 10:18 am ] |
| Post subject: | |
Probably has to do with the overdrive. When the overdrive locks out the RPMs drop. It doesn't have to up/down shift gears. The lower your RPMs are the less fuel the engine needs (more MPGs). |
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| Author: | pokefan [ Thu Jul 10, 2008 10:29 am ] |
| Post subject: | |
At 110 you're creating more drag so I would think that would have some impact on your MPG. How much I don't know but I'm sure there is an effect. |
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| Author: | ATXKJ [ Thu Jul 10, 2008 10:45 am ] |
| Post subject: | |
The only way you should have the same engine speed at 100kph and 110 kph - is if your torque converter is slipping at 100 and locked at 110. (if you've got a clutch and it's that bad it needs to be replaced) aerodynamic effects really start having an influence about 50-55 mph (~90kph) and from there the resistance increases exponentially with speed - in an Accord - it may be aerodynamic enough that an overdrive gear at 110 cruises at a lower rpm and is therefore more efficient - but in a KJ - it'll be worse. |
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