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10-16-2010, 04:53 PM | #1 |
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What's the most efficient speed?
Hi, has anyone worked out what the most fuel efficient speed to be in Cruise control is? When I'm in the car with the family I try to at least try to be green...
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10-16-2010, 05:23 PM | #2 |
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About 50 mph in top gear. The slower you go, the more efficient the car is. I can't do that.
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10-16-2010, 07:13 PM | #3 |
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10-16-2010, 07:39 PM | #4 |
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1st gear constantly bouncing up and down on the fuel cut-off.
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10-16-2010, 11:47 PM | #7 |
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Actually 0mph is the most fuel-inefficient speed because the engine could be on but your not making any progress.
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10-17-2010, 03:31 AM | #9 |
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Still no clue...
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10-17-2010, 04:03 AM | #10 | |
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Hahahahha...Same here mate!
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10-17-2010, 10:26 AM | #18 | |
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Quote:
http://www.m3post.com/forums/showpos...9&postcount=16 Remember to turn off cruise control when you go up or down a hill and turn off the power button. When going down the hill, the car actively uses the brakes to adjust the speed, when going up, it may not be the most efficient way of accelerating up to speed. |
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10-17-2010, 10:26 AM | #19 |
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10-17-2010, 11:22 AM | #20 |
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not applicable to today's engines anymore. i believe that it's up to 75 now, might be +5-10 mph on our cars. so those who are the most gas mileage conscious m3 owners are the ones getting the tickets
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10-17-2010, 12:49 PM | #22 | |
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More speed brings more air and rolling resistance, not to mention that more speed takes more power even without that. More power being used means more fuel is used. Always. As it's certainly not practical to cruise at, say, 40 mph in top gear out on the highway, just remember that more speed takes more power, and more power takes more fuel. 55 will return better mpg than 70, 100% of the time. Even 55 is dangerous, though. If you drive down in the 5th percentile, you're just as dangerous as if you were cruising at the 95th percentile, accident-wise. Speed doesn't kill, but speed differential certainly does - meaning the old guy trundling down the road at ten under the limit is just as dangerous as the punk at 25 over. |
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