Mph, mpg, milometer reading?? (1 Viewer)

Jul 29, 2014
862
2,083
Norfolk and Correze, France
Funster No
32,603
MH
Adria Twin
Exp
Had one for 5 years many moons ago. Now starting again.
My last two vehicles have had digital dashboards.
I love that I can easily see the exact speed and can change from miles to km with the flick of a switch.
Since having them I have noticed that my speed reading when I pass one of those green and red warning things is always 2 or 3 mph or kph different. If the warning thing says 40mph my speedo will read 37mph.
I always understood that speedos had read 2 or 3 miles high since the year dot to discourage speeding but the old needle dials didn't really allow you to see accurately what the speedo said.
My query concerns that difference.
Does this difference apply to the miles registered on my milometer? Or does a reading of 40,000 miles really equate to 37,000 miles. Likewise, if I fill up with fuel and divide the litreage by the clocked miles on my dash am I out by a few miles per gallon?
Opinions would be welcome.
 

Minxy

LIFE MEMBER
Aug 22, 2007
32,728
66,832
E Yorks
Funster No
149
MH
Carthago Compactline
Exp
Since 1996, had Elddis/Swift/Rapido/Rimor/Chausson MHs. Autocruise/Globecar PVCs/Compactline i-138
I think the number of miles will be correct, it's just that when they put the needle on the speedo they moved it to the right slightly so it over-reads the speed! :D
 
Aug 18, 2014
23,957
135,664
Lorca,Murcia,Spain
Funster No
32,898
MH
Transit PVC
Exp
16 years since restarting
Since having them I have noticed that my speed reading when I pass one of those green and red warning things is always 2 or 3 mph or kph different. If the warning thing says 40mph my speedo will read 37mph.

If you are talking about the "speed warning "flashing signs in the UK,then ignore them .They do NOT give the correct speed They are set to depress your speed even more by over stating the speed. Whenever I see one I always check against the 2 gps's & if it is flashing 40mph the gps's will be showing about 36/7.
All this does is make people go even slower so they are barely exceeding 30 mph!!
 
Jul 12, 2013
3,889
5,295
The City of Henlow
Funster No
26,906
MH
Adria Supreme
Exp
Since 1980
... but hopefully avoided crossing the fine line between speeding fines and having a fairly clean bill of health
 

pappajohn

LIFE MEMBER
Aug 26, 2007
43,430
50,247
Dark side of the moon
Funster No
172
Exp
Since 2005
I always understood that speedos had read 2 or 3 miles high since the year dot to discourage spe
The law, and construction and use regulations, allows a speedometer to show a speed FASTER than true speed to a maximum of 10%... It can be anywhere in that 10% error.
A speedometer CANNOT BY LAW show a speed SLOWER than the true speed.

The roadside sign will be set higher than true speed to encourage you to slow down even though you may be below the signposted limit.
 

Allanm

Free Member
Jun 30, 2013
5,431
9,192
Cotes d'armor, France
Funster No
26,730
MH
Burstner Harmony TI 736 G
Exp
Since 1987
There’s a good chance your total mileage will be out too. I’ve never really taken much notice of my total mileage or had anything to compare it to, ( or any need) but earlier this year I hired a large Renault van in France to help my sister move house. I estimated my mileage ( kilometerage?) was going to be about 2000 km. ( my house to my sisters, 900 km each way, and about 100 km running around while I was there with a few km in hand)
I noticed, as usual, the speedometer read high compared to my sat nav.
When I got home and handed the van back I was surprised that it said I had only covered just over 1600 km, around 300km less than I had actually travelled.
Just shows how totally inaccurate the speedo was on a brand new Renault van.

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C

Chockswahay

Deleted User
When I got home and handed the van back I was surprised that it said I had only covered just over 1600 km, around 300km less than I had actually travelled.

Well if you pay by the mile/kilometre then that would be a good thing surely :LOL:
 
May 7, 2016
7,365
11,945
West Sussex
Funster No
42,951
MH
Malibu Van 640 LE K
Exp
Since 2003
I think the number of miles will be correct, it's just that when they put the needle on the speedo they moved it to the right slightly so it over-reads the speed! :D
I agree. I have two vehicles with both analogue and digital speed readings. The analogue speedos always reach the the limit a bit before the digital one and the digital readings are generally in line with gps ones.
 

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