Apparently very common.
Many years ago, when I first got a handheld GPS, I tested it against my
92 Civic--and found that the Civic's speedometer was showing 5mph fast,
no matter what.
Fast forward to today. I'm driving my mother's 94 Civic home to sell
it; interestingly enough, I'm driving in exactly the same place I drove
years ago when I tested my 92...and the GPS shows that my mother's 94
behaves exactly the same way as my 92 did.
it's the way of the world. speedos are required to be within 10%.
almost everyone opts for the "fast" solution, some more so than others.
[bmw and ford really push the bleeding edge, especially over 70 where
there is no legal accuracy requirement.]
the reasoning is quite simple. customers want their car to be "fast".
[faster 0-60, bmw drivers bowling along at what they think is 85...]
cops want cars to be "slow". everybody's happy. it makes no difference
to fuel economy. it stops you getting tickets. i see no problem.
The issue is really the odometer which does cost money by accelerating
depreciation, maintenance intervals, trade-in intervals and warranty
expiration. The odometer and speedometer do not necessarily have the
odometer/speedometer inconsistency is true, but even if the odometer is
off, what impact does it have? what's the difference between a 30k mile
car and a 33k mile car in value? it will affect you if you lease a car,
[which incidentally is a very high proportion of bmw "sales"] and you go
over your lease mileage limits, but again, the manufacturer wins - no
incentive for them to erode the 10% "slop" they're allowed. and how are
you going to "prove" a problem? "sorry sir, you can't have had your
tires inflated properly."
I read a sci-fi short story many years ago called "The Marching Morons."
(IIRC) One of the major facets of the theme of a populace ignorant of the
stupidity of their lives was found in their cars. The protagonist came from
present day to find himself in that future, and when he was driven somewhere
in a "modern" car he noticed irregularities. The speedometer swiftly hit 300
mph and there were sparks blowing past the window, but the scenery moved
past at about 35 mph and the time it took to get to their destination was
more consistent with 35 mph than 300. But... everybody was happy!
On Sun, 31 Dec 2006 21:32:36 -0500, Elmo P. Shagnasty wrote:
Got a Garmin c320 GPS for Christmas. Checked my speedo on a long trip
yesterday, and much like the street-side police checks, the GPS shows my
speed as within 1MPH at all ranges.
They certainly have gotten better over the years!
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