Ford has a 2% margin on the low side on their speedometers. There is no
"Industry Standard".. Its what the automakers build into their vehicles....
The reason is for changes in tire size as they wear, and other factors as
The Ford factory manual I have for the 94' Escort/Tracer says the
"speedometer indication is biased high", so the indicated speed is equal
to or higher than the actual speed. They say this is to "protect the
consumer against violating speed laws". The speedometer on my 94' Escort
read about four percent high with the tires that came on the car. When I
replaced the tires with the next larger size, the speedometer/odometer
was very accurate. It was off by only a tenth of a mile in forty miles.
Oh boy Are you in for a surprise one day.
There are specifications for vehicles.
The "best" they can do is 10% up or down.
But if you wish to legislate for these technical devices to do better
you can, but they still cannot comply.
I know. I've checked all the specifications. I Australia we have a
claytons standard. On page one, the give you all the specs., and on the
nxt page they give the specs an exemption. According to local state laws.
Who are you going to believe, the people who manufacture the cars, the
people who gather taxes by deceiving people or the speed camera
manufacturers who also amke money out of these things? Before you know
it they will lower the speed tolerances and you will pay through the
nose for minor infringements like we have in Victoria Australia. 5%
And the punishment doesnt even fit the crime.
Dont know your driving style, but I dont sit at stoplights myself and I
STILL get abour 15-16mpg city with my 2000 Ranger 3.0L FFV 5spd trans and
4.10 rearend.. I have 245/75R16 FACTORY sized tires on my truck... Also a
factory 2" suspension lift (TRAILHEAD package)...
I get about 19-21mpg on the highway, 17 when pullin a 5x8 u-haul trailer...
2000 Ford Ranger 3.0L FFV 5spd Mazda Trans 4.10 rear and pushin 113,000mi.
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