avg speed wrong?
So when you get clocked by a Cop and they pull you over and say, "Do you know how fast you was going?" You can give them and honest answer because if you are driving in speed limits(as your car shows) you wouldn't be hiding anything. So who would the Cop blame?!(Probably wouldn't believe the driver anyway)
I'm not sure also though, because sometimes or some days when I do drive 60mph I seem to be going slower then what it was before.
I'm not sure also though, because sometimes or some days when I do drive 60mph I seem to be going slower then what it was before.
CL Community Team
Joined: Dec 2005
Posts: 5,702
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From: NJ
Quite true. The spec for speedometer accuracy is -0 to +5 percent. Another thing that works in your favor is cosine error; the radar (or laser) gun measures the speed that you are moving towards or away from it, so unless you are headed directly towards or away from the cop, he'll read a speed that is slightly lower than you are actually traveling.
Moderator
Joined: Jun 2006
Posts: 2,752
Likes: 28
From: Utah
Reset (0 out) the average speed when driving on the highway with the cruise set and you will see how hard it is to maintain the average speed. By resetting (0 out) the tank mpg while moving with the cruise on, you can also find out exactly what speed gets the best mpg.
Koz
Koz
Quite true. The spec for speedometer accuracy is -0 to +5 percent. Another thing that works in your favor is cosine error; the radar (or laser) gun measures the speed that you are moving towards or away from it, so unless you are headed directly towards or away from the cop, he'll read a speed that is slightly lower than you are actually traveling.
that might answer some of the reasons why, even though I'm going 10 miles over the speed limit the cop didn't even bother to pull me over.
Resetting the AVG MPG while cruising to figure out the best speed for economy doesn't really work since the most fuel efficient speed is below what you can realistically travel for long periods of time (below 55 MPH).
Moderator
Joined: Jun 2006
Posts: 2,752
Likes: 28
From: Utah
Koz
That might be the most efficient RPM for the engine, but wind resistance is exponential. I've done quite a bit of experimentation during my many, many 40 mile commutes to and from the lake. The lower I set the cruise control, the better the mileage. I average 36 MPG on that stretch of highway if I set the cruise control at 60 MPH (via GPS). It is surprising how quickly it falls above 60 MPH. I haven't tried 55 MPH since that's below the speed limit.
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