Lowering with 16"

[PetersRedYaris]

Originally Posted by Go4th

That don’t mean your odometer is wrong.
They may just have the speedometer calibrated a few mph off on the top end on purpose. Lots of times your dead on speed on the slower mph than the higher mph. They want you to think that you’re going that speed to help you.
Kind of like your clock. You may have it set 5 mins fast so when that alarm clock goes off you actually have five mins more.
Also I went to NC one time and the GPS said I was off route and actually I was on the exact road I was to be on per its directions. I switched lanes and it said I was going the right way. Switched lanes back it thought I was off route again. So even that GPS thing is not right sometimes. I figure it was the elevation and maybe the GPS was not updated that this is a 6 lane highway.

You could be right although I think it would be rediculous if they did that??? I'll check my miles vs. the actual mile markers. Also, location of a road has nothing to do with measuring speed. Older GPS maps, and newer ones, may not be up to date, but the fact is your GPS doesn't need to know what road your on to calculate speed. They calulate speed based on a series of points and the time it takes to move from one to the next. Even the small handheld cheap ones can do that.