How long does it take to adjust to using the big center dash Spedo?

I find that its off 3 mph such that when going indicated 75 really traveling at 72 mph.

I also find the digital mph useless as I am so use to analog needle as a reference. With the an analog you can see a need for throttle input where as with the digital you see you have experienced a drop in speed.

So far, it's the only car I've ever driven by tach. 3000 RPM in 6th gear = 75 mph.

 

I dont recall too many analog speedo displays being absolutely accurate but to answer your question about adjusting to the large centre speedo, for most drivers i suspect only a few days at most. If its that big of a problem for you then maybe you could mount a GPS.

There is a similar thread here discussing this issue.

 

Most speedos are on the fast side, I am guessing that's by design.

 

I am at a disadvantage as it's my wife's car. I drive it only occasionally and the transition to the center mount speedo take some getting use to.

 

it's by design, and i only use the digital readout. i almost never look at the center speedo

 

Typically the speedo is designed off by atleast 1 to 1.5 mph where the speedo indicates you are going faster than actual speed. This prevent the car manufacture from getting sued that someone was going faster than what thier speedo indicated. In talking to a state trooper friend, he mentioned that a quick way to calculate mph is to set your cruise control on the interstate to any speed you wish and with a stop watch time between the mile green markers. With a little math you can convert the time in seconds into miles per hour. Surprisingly, my speedo matches the Garmin mph which was off 1.5 mph.

If you travel 1 mile in 60 seconds, you are traveling 60 miles per hour. If you travel that mile in 55 seconds, what is your speed in MPH?

Helpful conversion:
Date: 07/12/2000 at 16:19:12
From: Doctor Rick
Subject: Re: seconds to MPH conversion CHART

Speed is distance divided by time. If the distance is 1 mile and the time is T seconds, then the time in hours is T/3600, and the speed is

Speed = (1 mile)/(T/3600 hours)= 3600/T

That's pretty simple. The table looks like this:

Seconds MPH
------------
36 100.0
37 97.3
38 94.7
39 92.3
40 90.0
41 87.8
42 85.7
43 83.7
44 81.8
45 80.0
46 78.3
47 76.6
48 75.0
49 73.5
50 72.0
51 70.6
52 69.2
53 67.9
54 66.7
55 65.5
56 64.3
57 63.2
58 62.1
59 61.0
60 60.0
61 59.0
62 58.1
63 57.1
64 56.3
65 55.4
66 54.5
67 53.7
68 52.9
69 52.2
70 51.4
71 50.7
72 50.0
73 49.3
74 48.6
75 48.0
76 47.4
77 46.8
78 46.2
79 45.6
80 45.0
81 44.4
82 43.9
83 43.4
84 42.9
85 42.4
86 41.9
87 41.4
88 40.9
89 40.4
90 40.0
91 39.6
92 39.1
93 38.7
94 38.3
95 37.9
96 37.5
97 37.1
98 36.7
99 36.4
100 36.0
101 35.6
102 35.3
103 35.0
104 34.6
105 34.3
106 34.0
107 33.6
108 33.3
109 33.0
110 32.7
111 32.4
112 32.1
113 31.9
114 31.6
115 31.3
116 31.0
117 30.8
118 30.5
119 30.3
120 30.0
121 29.8
122 29.5
123 29.3
124 29.0
125 28.8
126 28.6
127 28.3
128 28.1
129 27.9
130 27.7
131 27.5
132 27.3
133 27.1
134 26.9
135 26.7
136 26.5
137 26.3
138 26.1
139 25.9
140 25.7
141 25.5
142 25.4
143 25.2
144 25.0

- Doctor Rick, The Math Forum
http://mathforum.org/dr.math/