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      10-16-2010, 04:53 PM   #1
tomvcarter
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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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Quote:
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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...
90
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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, 10:32 PM   #5
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Standing still with the engine turned off. Best way to be green.
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      10-16-2010, 11:19 PM   #6
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0 is the most fuel-efficient speed since no gas is burned.
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      10-16-2010, 11:47 PM   #7
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0 is the most fuel-efficient speed since no gas is burned.
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, 12:29 AM   #8
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i never cruise in the M
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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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Quote:
Originally Posted by Radiation Joe View Post
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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Hahahahha...Same here mate!
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      10-17-2010, 05:17 AM   #11
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Prius.
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      10-17-2010, 05:27 AM   #12
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55; the study was done decades ago which is why most states have a 55 speed limit.
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      10-17-2010, 05:50 AM   #13
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I beleive in the M it is 70. There was a thread about it a long time ago
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      10-17-2010, 09:07 AM   #14
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between 75 and 90 for me.
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      10-17-2010, 09:12 AM   #15
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WOT to 55 then cruise
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      10-17-2010, 09:31 AM   #16
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Actually, it's 76.2361932 mph. I did the math... I would show you the calculations but you would and explode
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      10-17-2010, 09:47 AM   #17
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Actually ~76 is my experience.
Pretty consistent 22.4 mpg.
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      10-17-2010, 10:26 AM   #18
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Quote:
Originally Posted by Radiation Joe View Post
About 50 mph in top gear. The slower you go, the more efficient the car is. I can't do that.
+1 in this situation on flat ground you'll get about 30 mpg! But your engine speed in a 6MT will be 1500 rpms, so you might be lugging the engine.
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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Quote:
Originally Posted by cawest19 View Post
Actually, it's 76.2361932 mph. I did the math... I would show you the calculations but you would and explode
I'd like to see this, what would be the mpg for a 6mt?
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      10-17-2010, 11:22 AM   #20
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Quote:
Originally Posted by xxxryno View Post
55; the study was done decades ago which is why most states have a 55 speed limit.
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, 11:41 AM   #21
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Quote:
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Actually ~76 is my experience.
Pretty consistent 22.4 mpg.
+1 this is your answer right here.
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      10-17-2010, 12:49 PM   #22
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Quote:
Originally Posted by tomvcarter View Post
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...
The straight answer is to go as slowly as top gear will permit while the engine is still cruising smoothly.

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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