tag:blogger.com,1999:blog-21503568.post4781526007622484431..comments2023-11-03T06:32:28.410-04:00Comments on Staring At Empty Pages: Speedometer accuracyBarry Leibahttp://www.blogger.com/profile/14205294935881991457noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-21503568.post-41229929906675681532009-08-26T12:24:21.542-04:002009-08-26T12:24:21.542-04:00The tires are the standard recommended size, but t...The tires are the standard recommended size, but they're not the same brand that was installed when I bought the car. Perhaps, indeed, that's part of it.<br /><br />Absolutely right on "interpolation"; that's an error, and I'll correct it.Barry Leibahttps://www.blogger.com/profile/14205294935881991457noreply@blogger.comtag:blogger.com,1999:blog-21503568.post-35634928909154698112009-08-26T12:04:31.440-04:002009-08-26T12:04:31.440-04:00My experience has been different: the speedometer...My experience has been different: the speedometers agree closely with GPS devices I have compared them with. It might be worth checking the recommended tire sizes in your car's owner's manual against what's actually mounted. Sometimes there is a range of sizes there, and if the tires are slightly different from what the car expects, a 3% bias in the speedometer measurement is quite possible.<br /><br />But I do have to take issue with your terminology a bit. Where you say "the precision of the speedometer's [speed display] is 5 MPH" I would say that's the <i>resolution</i> of the display, not the precision. Precision has more to do with the standard deviation of the measurements than how many lines are on the dial. Also, "68 or 69 MPH" is an interpolation, not an extrapolation, unless your speedometer stops at 65, which I tend to doubt.<br /><br />See what happens when I read this <i>after</i> your "Blogs as Journalism" post?Unknownhttps://www.blogger.com/profile/05459244944209591455noreply@blogger.com